Detect system-default language

[mrfatguy]

Overview

Please, implement a feature that will set in-game language to the same as system-default language, if there is no language preference done by player saved (#49).

Narrative

• As a player
• I want to see game in my system-default language
• So that I don't have to change in from English, if this is not my default language

Acceptance Criteria

• Given that I have started a game
• And that I haven't changed language ever before
• When I pass the logo screen
• Then I can see that the entire game is in the same language as my system-default language

For the webapp version, I think you have to read default language out of browser settings (set in request header).