Internationalization

[Nico-Duduf]

Translate the translator :) in French and Spanish

• [x] Create translations files
• [x] Translate in French
• [ ] Translate in Spanish
• [x] Add language in settings
• [x] On first startup, set language according to the user's local code

[oktomus]

I'll create need files for french :)

[oktomus]

Two possibilities for changing the language from the preference window:

• Retranslate the ui on the fly -> Unsafe, it's what I implemented but it generates an infinte loop
• Retranslate the application on restart -> Much safer

In any case, there is a need to spearate Ui classes from functionality classes. Like this, we could fetch the database before launching the app. And that would be great.

Since there is a lot of work, I am wondering if going on python wouldn't be faster ? Maybe it will be harder to export it to other platforms ...