Translate Pixel Dungeon

[rodriformiga]

Changes were made to translate the game.

• Including error handling when the character is not found in the font files;
• Creating procedures to return the strings, according the language context;
• Created treatment to convert the special characters when it does not exist in the font files.

NOTE: This Pull Request will not affect the remainder of the game, and can be applied without changing the Pixel-Dungeon repository.