The main change is translation to fr, it, es, pt, ru. Some textmod changes and bugfixes and community art.

Also some achievements have been removed from steam to help completionists (though they are still achievable in-game):
Indecisive++, Classic Hell streak, Chaos++++++++ (100+ keywords), total-kills 0, crosses-rolled 0, hell victory, quadruple-revive, quintuple-revive, x6-revive, 1000000 deaths, 100000 deaths, Choose-Party 7, Bedtime

FEATURES -
translated into Portuguese, Spanish, Russian, French, Italian
thanks to Lorenzo Ruiz, Gerardo Franco, Thierry Viguier, Andrii Pokynchereda & Douglas Brum
more community art
new keyword sloth to replace alliteration
poem item changed
a few extra togs
some alternate scribbles for ritem
re-enable jinx

BALANCE -
some graph and itemgen changes
ting nerf

BUGS -
increase hero limit to 36 and attempt to enforce it better
name tag fix
hopefully fixed bad caching causing textmod dev nightmare
textmod seqphase ui fix
fix custom party and raid speedrun
messed with shifter on monsters
tinker with genfailrandom
green hero texture chat crash fix

MISC -
various wording changes to allow for translation

Just small bugfix patch for 3.1. Hopefully this fixes achievement issues. No leaderboards are reset, but it will fix submission issues. (it may let you attempt to submit when you already have a better score also)

BALANCE -
graph changes
heroes changed: prodigy
modifiers changed: strained top, double monster hp, skip rewards 4, death shield, mortal, *stone*, barrel time
ritem slight nerf
level up bless nerf
bench the idols

BUGS -
better achievement migration
fix for error rerolling curses
fix monster fluctuate
custom mode scrolling stats

MISC -
replica now keeps names
more community art
togorf & togunt
removed blessing and hero random rewards
richtext facade, .img.facade
20 heroes max
failsafe negative item
ban heavy dice from cursed
show passives and spells in sides view
[nokeywords] doesn't affect later keywords
no tweaks in speedruns (except skip)

3.1 patch notes

FEATURES -
better performance
steam achievements
hd Fonts
blyptra mode
roll speed
landscape lock
--modding stuff--
custom tactics, custom-er side effects, summon heroes
lots more, textmod v1.1 I guess
broke half the 3.0 mods, sorry

BALANCE -
adjustments to the graph
nerfed 'myriad options'
tinkered with generated heroes

heroes changed: lazy whirl scrapper barbarian eccentric wanderer scoundrel clumsy dabbler gambler ludus agent alloy knight bard prince poet valkyrie fey surgeon fate prodigy cultist evoker jester seer warlock ace primrose spade presence statue sphere coffin alien tainted vessel jumble pilgrim doctor

monsters changed: the hand, sudul

modifiers changed: hero immunity, reduced defence, 4hp, 3 pip pain, barricade, expensive spells, immune monsters, lowest exert, heavy weapons, static blanks, back to basics, double monster hp, stone first, dooms, monster rows, mortals, caltrops, heavy dice, tough hp, big hitter, death shield, sickly, mana debt, tower, monster shields, monster hp, spiky monsters, wurst, nth death, manymore

items changed: color-restricted items, tracked, cursed bolt, wand of wand, anchor, infused herbs, coin, trowel, foil, kilt, polearm, flickering blade, buckler, autumn leaf, clumsy hammer, tower shields, fletching, clef, pillow, terrarium, shortsword, wristblade, enchanted shield, pocket phylactery, clover, syringe, duvet, harpoon, wild seeds, relic, cracked plate, magic staff, obol, idol of aiiu, antivenom, soup, tiara, natural, powerstone, full moon, dragonhide gloves, eggshell, fangs, dynamo, cocoon, pauldron, sponge, gizmo, determination, jewel loupe, eucalyptus, candle, water, sparks, hourglass, cauldron, enhance wand, ornate hilt, troll blood, demon claw, boots of speed, burning halo, poison dip, katar, serration, brimstone, wax seal, spike stone, egg basket

BUGS -
fixed some exploits
double permadeath crash
added some new bugs to balance out the ones I fixed

MISC -
more party layouts for cursed modes
removed rise, grave spam, poison immunity from cursed modes
messed with achievements
changed some names
messed with command limit
renamed heroes keep their new name when levelling up

FEATURES -
Dice scale
Now submits current save when using 'report bug' from Titlescreen
Added missing nightmare transition tile
Smarter warnings for max mana
Experimental textmod custom spell support (.abilitydata.)

BUGS -
Fixed some system languages not working (Turkish +more?)
Fixed textmod savebricking bug
Stop greens generating with modifier passives
Stop green hats from being offered
Improved levelling up interactions with custom hero pools, still some bugs I think though...
Fixed a bug that could cause enemies to skip a turn
Remove broken 'custom party masochist' achievement
Sarcophagus cannot flee (also 'no flee' modifier)
Allow jinx.sandstorm^1
Fixed some scrollwheel stuff
Improved v2-v3 save migration (too late for most!)
Bell/baron passive now work better with generated monsters
Fixed selfheal breaking keywords like underdog
Minimap fixed
Iphone notch tutorial issue fixed
Some more too boring to mention

3.0.16: Very minor patch for steam only.

- Fixed Mac unable to launch. Thanks to those who spotted it and solved it for others!
- Fixed resurrecting heroes not working under some circumstances
- Can under/over-pick modifiers by a little more
- New monster- golem! Sort of, they were in the game but not tagged for any zones by mistake. "steam-exclusive" until the other platforms update.
- Changed Bag of Holding because it's too much for the game to handle combined with other meta-items
- Swap one fighter for lazy in tutorial run
- Bell passive now works with rmon
- Pilgrim locked behind an early achievement.