Create fi_FI.lang

Add finnish localization file
Translations may not be 100% accurate
If there is someone Finnish, feel free to fix problems.

Käännöksissä saattaa esiintyä virheitä
Jos siellä on joku suomalainen, saat korjata virheitä

Translated: Enchantments, Potions, Entities, Blocks, Items, Fluids, GUI, Other, Aspects, Research Categories, and 3 entries of Thaumonomicon (Research, Knowledge Fragments, and Aspects of Magic) More will be translated soon...