Launcher translations

[ItsSim]

The launcher currently has 7 (2 of them unfinished, missing strings) translations for its UI.

• English (original)
• Spanish (unfinished due to new strings)
• Italian (unfinished due to new strings)
• Polish (100%) by Emiloowski
  • Revision 1 by nikok558
• Russian (100%) by Alven
• Dutch (100%) by Seger
• Brazilian Portuguese (100%) by LucasRK

If you are willing to help with UI translations (these are only for the launcher, not the game) please take a look at the UIText.json file:
https://github.com/ItsSim/fsolauncher/blob/master/src/fsolauncher_ui/uitext.json
You may complete the language sets that are already present but unfinished, or add your own language.

It’s a good idea to use translated sentences as close in length as possible to those of the original text. This is to ensure that the UI text is consistent and there are no spacing problems.

Submit a pull request adding your set of strings. The key has to be the first two letters of the language code. For example: English - en_US or Spanish - es_ES ("en" and "es").