Special-case Serbian as not needing @cyrillic
Special-case Serbian as not needing @cyrillic

The standard codes sr and sr_RS are used in gettext, not sr@cyrillic as
ICU was forcing.

vslavik/poedit,vslavik/poedit,c72578/poedit,nawawi/poedit,nawawi/poedit,nawawi/poedit,alexhenrie/poedit,c72578/poedit,vslavik/poedit,PKRoma/poedit,vslavik/poedit,alexhenrie/poedit,alexhenrie/poedit,c72578/poedit,c72578/poedit,alexhenrie/poedit,PKRoma/poedit,PKRoma/poedit,nawawi/poedit,PKRoma/poedit,c72578/poedit,alexhenrie/poedit,nawawi/poedit,vslavik/poedit,PKRoma/poedit