In Finland, the BECMI set (minus the Immortal rules) was translated in the late 1980s. A Finnish translation of the AD&D 2nd edition was also in the works, but the project was cancelled in the early 1990s when the publisher went under.
In 2012, I published a full translation of the 3.5 SRD on a website called
Lohikäärmeen Luola ('Dragon's Den'); basically, it's the Finnish equivalent of the Hypertext d20SRD, except that it only contains the core rules.
Thanks, I'll add that to the OP.
Oh, and since you're looking for "gamer's glossaries",
here is the comprehensive Finnish-English glossary for Lohikäärmeen Luola.
That's cool. I only know of one official Finnish analogue in the D&D Worlds--Vaasa in the Forgotten Realms is likely to have been originally conceived as a "FR-Finland", though it came to be mixed with other fantastic motifs. (Well, and Hyperborea from Conan's Hyborian Age, since there were a few D&D Conan products.)
There's also Mielikki and Loviatar, and their planar realms, and the rest of the Finnish pantheon from the 1e Deities & Demigods.
In Mystara amateur works, there's the
Kingdom of Kaarjala.
How flavorful for a Vaasan PC or Vaasan campaign to use these words:
taistelija "fighter"
paladiini "paladin"
samooja "ranger"
barbaari "barbarian"
velho "wizard"
taikuri "sorcerer"
pappi "cleric"
druidi "druid"
munkki "monk"
haltia "elf"
kääpiö "dwarf"
puolituinen "halfling"
maahinen "gnome"
puoliörkki "half-orc"
spell names:
tulipallo "fireball"
taikavasama "magic missile"
luolasto "dungeon"
lohikäärme "dragon"
I'd like to see a Finnish "gamer glossary" included in a 5E
Hyperborean Adventures culture book, which also included Estonian, Saami, perhaps some of the Finnic languages of inner Russia (Komi, Mari), some representative Siberian languages (Yakut and Chukchi), Ainu (from northern Japan), Aleut, and Inuit.
There'd be a whole chapter on "Finnish or Quasi-Finnish Adventures", with Vaasa as one campaign model, and a "Finnic Earth" as another, an 1890s "Gothic Finland" from
Masque of the Red Death, and 5e "D&D Modern"
Urban Arcana Finland as another.
"Finnic Earth" would be an entire D&D World which is actually shaped to be like
how Finnic legend portrays the earth, as in the
Kalevala, the Kalevipoeg, and the
Mastorava.