GUI: Sort languages list
|Reported by:||jvprat||Owned by:||sev-|
The attached patch sorts the list of languages alphabetically in the game options dialog, making it much more usable.
I've also changed the enum definition to match the same sorting. Feel free to ignore this part if there are some assumptions about its order/values.
Ticket imported from: #1706179. Ticket imported from: patches/751.