Write translations for all supported languages

[chmielulu]

Currently translations are written only for English, Polish and German. This needs to be changed.

• [x] Bulgarian
• [x] Chinese (simplified)
• [x] Czech
• [x] Danish
• [x] Dutch
• [x] English (American)
• [x] English (British)
• [x] Estonian
• [x] Finnish
• [x] French
• [x] German
• [x] Greek
• [x] Hungarian
• [x] Italian
• [x] Japanese
• [x] Latvian
• [x] Lithuanian
• [x] Polish
• [x] Portuguese
• [x] Portuguese (Brazilian)
• [x] Romanian
• [x] Russian
• [x] Slovak
• [x] Slovenian
• [x] Spanish
• [x] Swedish

[chmielulu]

Done by pull request from @It4m #7 and b86c28d92467d71e6d411fecebfe212edaac8b9e.