Use Title Case for welcome buttons on macOS & GTK+
Use Title Case for welcome buttons on macOS & GTK+

As is the platforms' standard and as is done in other parts of Poedit's
UI.

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