ui integration of time zone in Kiosk

[urapadmin]

we need an unequivocal time zone (preferably leading to an ISAN time zone name) and a locale like en_US for internationalization. The latter is not necessary for time zone support but since I am on it, let's just gather that information.

The same information should be changeable at any time under profile.

• 2787

[urapadmin]

This is using the kiosk_time_zones table. see #2784 I guess we need an api for this first. I am also wondering if it would make sense to cache this locally. The date of the last time zone entry should allow me to only download the records since last modification:

• 2787

[urapadmin]

no, not asking for it at login. The current time zone is taken from the browser or database and then managed via cookie: #2790

• [x] The client shows the time zone in red if the kiosk_tz_index and the client_tz_index differ
• [x] The client allows permanent change of the timezone via menu item the user menu. A popup appears:
  • [x] shows the complete time zone and an explanation about the red alert (if any)
  • [x] allows to set a permanent explicit time zone
  • [x] allows to set it to use the browser's time zone
• [x] the recording_tz is optional. If it is set for a user it is being used for manually recorded fields (usually when doing legacy recording)
  • [x] the dialog should allow settting the recording time zone to "auto", which is the default, or an explicit selection.