Increase the default window size to 900x600

This will make the game playable on touchscreens without needing to
resize the window. The default theme is scalable, so why not make the
tiles big enough to touch?

https://bugzilla.gnome.org/show_bug.cgi?id=724830
Updated French translation
Updated Ukrainian translation
Updated Hebrew translation.
Updated Polish translation
Finnish translation update by Jiri Grönroos
Deleted toolbar.page as no toolbar exists

https://bugzilla.gnome.org/show_bug.cgi?id=726073
Prepare 3.11.92
Updated Portuguese translation
Updated Brazilian Portuguese translation
Updated Danish translation
Updated Hungarian translation
Updated Russian translation
Updated Hungarian translation
[l10n] Update Catalan translation
Updated slovak translation
Updated slovak translation
Updated slovak translation
Updated Indonesian translation
Updated Serbian translation