Fixes:
- fixed the issue addressed by artpra (text label change when changing snooze time)
- fixed: listed custom alarm files where always split by the first dot ("13.Metallica.ogg" would become "13" with file extension "Metallica.ogg", thus not equal to "ogg"

Changes:
- Wallpaper background in landscape will be set the first time used (was initially off)
- Change in config file location:
The config file was located in /home/user/.config/cepiperez/ and is now moved to /home/user/.config/worldclock/
(it only contains your selected worldclock city codes and the preferences of wallpaper/seconds shown or not)
If you want to preserve this settings:
download info in the first post...

@marmistrz:
The clock replacement does show and support ogg files. Your finding could be related with the second fix. If not please give me the name of the ogg file not shown.