Return language selection to player settings

[ogamespec]

It was removed for perfectionist reasons. It should be returned as it is convenient.

Edits are here:
a27e718#diff-ed706354c042053c2b16073b53fdd85acaeadf17aae83404ec7b38323599f109

[ogamespec]

Brought back the lang column in the user table and brought back the language selection in the settings.

[ogamespec]

I think it's done. We'll tweak the little things as we go.