I don't have the game, so can't be of any real help - I assume that you've already checked in your game library if there's a separate installer for each language? If there's only a multilingual installer, i.e. the language can be changed from the game menu, and you can't do it, then I suggest you submit a support ticket.


EDIT: I just saw this post here, perhaps it's a similar case?

Changelog for Patch 1.1.3: Diamonds (are a Lizard's Best Friend) (added 13 March 2018):

New Features
* Players can now burrow to allied bases in 2v2

Balance Changes
* Lizard - 7 HP (from 8); 2 range only covers a diamond shape rather than a circle shape (slight reduction in attack range coverage at 2 range)
* Chameleon - 38 HP (from 40)
* Boar - Flamethrower Coverage of 6 tiles (from 10); Boar bomb 5 dmg (10 to structures), no longer hits air (was 7/14, hits air)
* Owl - 1 mouse per second up to 3, 7 second reload, leading to 3 mice every 10 seconds (was 1 mouse per 5 seconds), they live for 30 seconds (was 60), mice have 7 HP (was 10)
* Barbed Wire - 24 HP (from 30)
* Landmine - 12 Damage, 6 AOE (from 18/6); 0.4 second trigger (from 0.5 seconds); Can target cloaked Chameleons
* Machine Gun Turret - 28 HP (from 32)
* Artillery - 60 HP (from 50)

Bug Fixes
* Campfires no longer push back gristmill territory as if they had gristmill-sized range
* Artillery shots no longer remove decor objects (like trees) when they miss
* Lizard no longer hang out in back, waiting for a reservation position to open up

Story Mode
* Moved all single player unit stats over to Story Mode
* Snikaree Liberation (Hopper 1) - Start with Chameleons not Lizards
* Scrapetown Racket (Hopper 5) - Increase number of merchants by 2
* Frozen in Noe (Quartermaster 1) - Enemy spawn rate ramps up more slowly
* Howling Vell (Quartermaster 2) - Player starts with an additional mill
* Defense of the Cold Mark Lows (Quartermaster 3) - Archimedes starts with an additional mill, one fewer campfire on map
* Betrayal at Vacancee (Quartermaster 4) - Player starts with 2 additional farms
* The War For Meat (Quartermaster 5) - Player can build skunks, not pigeons, Campfires have Skunks not Pigeons, number of enemy on enemy kills required for Heroic reduced from 150 to 60, Enemies start with 1 mill with 4 farms instead of 2 mills with 3 farms
* What Might Be (Quartermaster 6) - Player can recruit falcon, boar and wolf instead of falcon, pigeon, skunk
* Awash in Solawa (Archimedes 2) - 50% fewer enemy landmines
* Vacancee Downfall (Archimedes 3) - Player can build mole instead of snake

edit

Changelog for Patch 1.1.4.0 (added 09 April 2018):

New languages
* German

Balance Changes
* Lizard - Reverted Diamond range to standard 2 range, 8HP (from 7HP), reduced Swift to 1.75x speed (from 2x)
* Toad - 8 HP, 12 Dmg + 3 AOE Dmg, no structure crit (was 9 HP, 6 Dmg, 3 AOE, double damage to structures)
* Mole - 22 HP (from 25)
* Pigeon - 1 DPS heal, 4 range (was 2 DPS heal, 1 range)
* Skunk - 32 HP (from 35)
* Fox - Reduced Swift to 1.75x speed (from 2x)
* Mouse - Reduced Swift to 1.75x speed (from 2x), 8 HP, 3 DMG (was 7 HP, 2 DMG)
* Boar - 4 DPS, removed structure crit (from 3 DPS + structure crit). Boar can move at 50% speed while firing. Boar bomb reduced to 3x3 (from 9x9) and boar bomb DMG is 20 (was 5 to units, 10 to structures), no longer targets commander
* Badger - No longer targets commander
* Artillery - 10 Range, Bullet lifetime 2 seconds, scales by range (was 8 range, bullet lifetime of 1.5 seconds at all ranges)


Changelog for Patch 1.1.4.1 (added 10 April 2018):

* Reduced Artillery range back to 8 (from 10) - bullet lifetime attenuation buff from the latest patch retained

Hello, I ve already seen that the spanish language is added to the game page in the store and in the settings (say "English, spanish and four more /in game"). But I still don'tt know how to change in game. Sorry for the insistence.

Thx

Changelog for Patch 1.2.0 (added 17 May 2018):

PS4 Crossplay
The long-awaited PS4/PC crossplay is now live, which means PS4 players can play against Steam and GOG players and vice versa. Note that the leaderboards are still segregated by platform.


New Discord Game - Pocketworld (Beta)
Head to the Pocketworld channel in Discord and type ’!team red’ (or green, blue, yellow) to declare yourself a member of a particular faction. When you play ranked matches, you’ll advance that faction’s territory on the map! Help your faction conquer Vyeshal and feast on your enemies!


New Languages
* German
* Brazilian Portuguese
* Turkish
* Russian


Balance Changes
* If a structure takes damage while building, it will stop earning health for 1 second (but it will continue to build). No more mill/mg tanking!
* Commander burrow time 2 seconds (was 2.5)
* Reptiles and Amphibians heal 3x as fast in friendly territory (1.5 HP per second after not taking damage for 5 seconds)
* Enemies can see what type of unit is building from all Tier 3 warrens
* Lizard: 7 HP (was 8)
* Mole: 20 HP (was 22), 2.5x damage to structures (was 2)
* Chameleon: 36 HP (was 38)
* Falcon: 15 HP (was 17)
* Skunk: 29 HP (was 32)
* Snake: 28 HP (was 27)
* Boar: 100 HP (was 120)
* Barbed Wire: 28 HP (from 24)
* Machine Gun Turret 5 Damage (was 6)
* Artillery: Range 10, Bullet time 2 seconds, Build time 50 seconds

Bug Fixes
* (PC) Fixed Mission Hint in Archimedes mission 3
* (PS4) Fixed Audio-related crash
* (PS4) Fixed online gameplay crash
* Increased Redplug timeout to 60 seconds to account for longer load times on PS4

Changelog for Patch 1.2.1.0 (added 07 June 2018):

Balance Changes
* Gristmill starting health reduced to 7.5 HP (was 22.5). Added a 1 second sell timer
* Campfires must now be stood upon to build them. This allows you to build moles and landmines next to them without having to build them.
* Unit collision radius reduced to 0.4 tile radius (was 0.5) - this was done to improve retreating -- units in the rear don't get pushed back quite so much. You may notice units will tend to bunch up a little more!
* Squirrel - 0.4 second movement freeze after shooting (was 0.25), 0.25 second cast time, 0.75 second cooldown (was 0 second cast, 1 second cooldown)
* Mole - 21 HP (was 21)
* Chameleon - 38 HP (was 36)
* Falcon - 16 HP (was 15)
* Snake - 30 HP (was 28)
* Balloon - 3 second reload, 15 damage per shot (was 2 second reload, 14 damage per shot)

New Features
* Streamer Mode option removes the button hints from the bottom of the screen while spectating or watching replays, and hides the match progress bar behind the match time
* Holding the analog stick in a direction during menu navigation will scroll more quickly

Bug Fixes
* Targeting highlight in 2v2 fixed
* Increased frequency of stormy and hail weather types in multiplayer
* Discord Rich Presence fixed on Mac
* Decreased VRAM usage
* Looping campfire/machine gun sound after match end fixed

Changelog for Patch 1.2.1: Calm Before the Storm (added 11 June 2018):

With a big patch in the rearview and a couple of big patches on the horizon, it was time for a small balance patch with a few quality of life improvements and bug fixes.

Balance Changes
* Gristmill starting health reduced to 7.5 HP (was 22.5). Added a 1 second sell timer
* Campfires must now be stood upon to build them. This allows you to build moles and landmines next to them without having to build them.
* Unit collision radius reduced to 0.4 tile radius (was 0.5) - this was done to improve retreating -- units in the rear don't get pushed back quite so much. You may notice units will tend to bunch up a little more!
* Squirrel - 0.4 second movement freeze after shooting (was 0.25), 0.25 second cast time, 0.75 second cooldown (was 0 second cast, 1 second cooldown)
* Mole - 21 HP (was 20)
* Chameleon - 38 HP (was 36)
* Falcon - 16 HP (was 15)
* Snake - 30 HP (was 28)
* Balloon - 3 second reload, 15 damage per shot (was 2 second reload, 14 damage per shot)

New Features
* Streamer Mode option removes the button hints from the bottom of the screen while spectating or watching replays, and hides the match progress bar behind the match time
* Holding the analog stick in a direction during menu navigation will scroll more quickly

Bug Fixes
* Targeting highlight in 2v2 fixed
* Increased frequency of stormy and hail weather types in multiplayer
* Discord Rich Presence fixed on Mac
* Decreased VRAM usage
* Looping campfire/machine gun sound after match end fixed

Changelog for Patch 1.3.0 (added 27 July 2018):

Balance Changes
* Squirrel - 0.25 second movement freeze after shooting (was 0.4)
* Toad - 7 HP (was 8). Primary and AOE damage is now centered on closest tile when targeting 2x2 structures
* Chameleon - 40 HP (was 38)
* Snake 28 HP (was 30)
* Falcon - 1.2 seconds of firing, 0.8 second cooldown (was 1.5 seconds and 0.5 seconds)
* Owl - 40 HP (was 50), no longer stop moving over enemies
* Barbed Wire can now hit stealthed Chameleons
* Landmines can now hit stealthed Chameleons
* Structures no longer heal if they are not in your territory
* Territory now symmetrical on all sides of mills and fires, resulting in larger territory

New Features
* Story Mode Standard and Random Seeds.
* Standard Story Leaderboards
* Map generation now adds ramps around spawn to prevent high ground within 3 tiles of spawn farms
* Map generation now takes water into account when assessing fairness
* Map generation now compares natural expansion distances when assessing fairness
* Map generation changed to create more organic shapes around bases instead of fortress-like topography
* Map fairness variables added to map generation xmls
* Single Player Balance updated to current multiplayer stats

Bug Fixes
* Story Mode - Meat will no longer spawn inside rocks
* Repeating sound bug fixed

Changelog for Patch 1.4.0.0a (added 6 December 2018):

Tooth and Tail :: Patch 1.4: Swine's Workshop (6 December 2018)

Save some room after your holiday meals, you'll need it for all the meat in this patch! Sweeping balance changes, as designed and requested by the community -- including Moles that are built from warrens (instead of individually) and Landmines that apply a Daze effect. The Level Editor is now live and custom maps are playable online and offline. And new multiplayer features like Neutral Cabins guarding the campfires and healing water for those nasty multiplayer burns. Incoming!

Editor
The Level editor we used to create the Story Mode hubs is now available for making multiplayer maps! Custom maps can be played online via Steam Workshop (Steam only) or offline (all platforms except PS4).

Build the balanced map you've always dreamed of and say goodbye to the whims of RNGesus!

Gameplay
Massive changes to some core design incoming! High level players have long complained about Campfires creating too much imbalance and reducing player choice. So we made them into cabins that have a neutral defender that must be killed before claiming!
Campfires are now Cabins When I originally designed the campfires, this is always what I intended for them to be: civilian pigs holed up in cabins out in the wilderness that you kill and cook on a spit. The cabin resident has a gun that shoots once per second for 3 damage. Once the cabin is destroyed, you must still spend 60 food to light the campfire. Campfires can be extinguished and re-lit just as before.
Change your Deck size You can now battle with up to 9 unit types, or as few as 1! Try out vs battles with the original 3 units we designed the game around: squirrel, ferret, and bullet hive.
Also:
Water heals in multiplayer - 1 HP per second, even outside territory.
Super Random Decks - Random decks now choose 1 tier 1 unit and then fill the remaining slots with entirely random selections.

Balance Changes
Some sweeping changes to unit balance, as researched and tested by our community! Aside from the headline Mole and Landmine changes, one subtle but interesting change is that short range units now also have a slightly shorter aggro range, preventing them from getting pulled and sniped quite so easily.

* Mole- Now spawns from a single tile warren, which can be built anywhere. Up to 3 moles can spawn from the warren, like any other Tier 1 unit. Mole Warren has 25 HP. Mole now has 14 HP, 3 DMG, 6 DMG to structures (was 21/2/5). Aggro range is 3 (was 4).
* Lizard- 8 HP (was 7). Aggro range of 3 (was 4)
* Squirrel- 0 second cast time, 1 second cooldown (was 0.25, 0.75). Removed movement freeze (was 0.25 seconds)
* Toad- 8 HP, 3 DMG to all affected units, 12 DMG to structures (was 7HP, 12 DMG to target, 3 DMG to AOE, no structure crit). Aggro range of 3 (was 4)
* Chameleon- 8 DMG/32 HP (was 6/40). Stealth Entry/Exit time is now 0.5/0 seconds (was 0.25/0.25). Aggro range of 2 (was 4)
* Skunk- 32 HP (was 29)
* Snake- 0 second movement freeze after attacking (was 0.25)
* Boar- 110 HP (was 100)
* Fox- 20 DMG per shot (was 24)
* Balloon- 14 DMG/20 HP (was 15/30). Visibility of 12 tiles (was 10). Fires every 2 seconds (was 3)
* Landmine- 8 HP, 18 Single target DMG, 2 DMG AOE (was 5 HP, 12 AOE DMG). Explosion radius 2 tiles (was 1.75). Activation time is 0.25 seconds (was 0.4) Applies a 1 second daze to all affected units that reduces attack/movement speed to 60%.

Changelog for Patch 1.5: Season 3 (added 26 June 2019):

Ladder Reset
Some players started to feel lonely on the top of the ranked ladder, some wanted to experience the thrill of fighting their way up, again - so we put everyone back to the bottom. Happy climbing!

If the ladder reset hits you just before you managed to complete the ranked achievements: No worries! We just happened to add alternative ways to get them…

Alternative Ways to Obtain Multiplayer Achievements
Some achievements required players to win (lots of) ranked games, which could make them very hard to get. Now there are alternative ways to unlock these achievements, all possible in unranked and offline matches against 1-2 CPU opponents.

- Agitator: Win a 1v1 against a medium CPU.
- Rabble Rouser: Win a 1v1 against a hard CPU.
- Militant: Win a 1v1 against a brutal CPU.
- Firebrand: Win a 2v1 against two medium CPUs.
- Hero of the Hungry: Win a 2v1 against two hard CPUs.
- The Great Provider: Win a 2v1 against two brutal CPUs.
- Fury of the Feast: Win a 2v1 against two ruthless CPUs.
- Deadbones: Win a 1v1 against a ruthless CPU in less than 5 minutes. (You can only get these achievements on generated maps, not on editor/workshop maps!)

Multiplayer Balance Changes
As a result of mods made and tested by the community, a couple of multiplayer balance changes is coming with this patch. Probably the most important changes in a nutshell are: Toads, Moles and Landmines get nerfed; Chameleons, Boar and Drumfire Cannon get buffed; Snake poison wears off outside territory, but slows down enemies while it lasts.

Now, here are all the juicy details:
- Daze - Only slows down movement (slowed down the whole simulation, including attack speed, before). This change makes mines less crippling in fights.
- Focus Fire - Can be used for a structure (group), e.g. for letting only your Balloons focus the incoming Badger (not the pigeons) or making your Drumfire Cannon shoot directly at the opponents' Mill (not the Pigs).
- Mole - 2 DPS, 3x crit (from 3 DPS, 2x crit), same power against structures, less against units.
- Toad - 7 HP, 3 damage, 6x crit (from 8 HP, 4 damage, 4x crit); structure crit only affects one tile, in the center of the explosion (applied crit to all structures in the aoe, before); aggro 3 tiles from own position (has been 2 tiles from rally point). They lose some of their power, but now they go after Lizards even if they are unattended.
- Chameleon - 36 HP (from 30 HP); 0.25s stealth entry time (from 0.5s)
- Skunk - 28 HP (from 32 HP); cannot target Commander (could target Commander, before)
- Snake - poison is cured 5s after last attack regardless of territory (used to be cured only inside own territory and lasted forever outside territory); poison slows down movement (Daze)
- Boar - 6x damage against structures (from 2x damage against structures)
- Badger - 60 HP (from 65 HP)
- Fox - 24 HP (from 25 HP)
- Barbed Wire - slows down movement speed by 80% (from 75%)
- Landmine - 4 HP (from 8 HP); 3s Daze duration (from 2s Daze duration), but only slows down movement, not attack speed
- Balloon - does not target Commander if enemy units are nearby (within a radius of 8 tiles)
- Artillery - 28 DPS (from 20 DPS)

Changelog for Patch 1.6: "As You Like It" + Season 4 (14 January 2020):

- a difficulty slider for the campaign,
- a ladder reset (Season 4),
- multiplayer balance changes,
- some fixes for multiplayer map gen issues,
- and a couple of smaller improvements & bug fixes.


Standalone installers updated: 1.5.1.0 ⇒ 1.6.0.0.