move locale directory into app and add icalendar dependency

- Move locale/ to appointment/locale/ for proper package distribution
- Remove custom LOCALE_PATHS configuration relying on Django's automatic discovery

Author: adamspd

locale/fr/LC_MESSAGES/django.mo renamed to appointment/locale/fr/LC_MESSAGES/django.mo

@@ -131,7 +131,6 @@
 
 APPOINTMENT_BUFFER_TIME = 0
 
-LOCALE_PATHS = [os.path.join(BASE_DIR, "locale")]
 LANGUAGES = (
     ('en', _('English')),
     ('fr', _('French')),