Improve Textual bulletins detail
- add page title (same style as on Dashboard page etc.) and show mode (viewing / editing)
- start / end / update dates should be in English
- do not show times on start / end: only date
- on sent bulletin, if user is allowed, show "create new bulletin" button
- show mountain region text in separate page
- on send, the backend must also update the last_update field!
- when there is no unsaved change, "Update" button must be disabled
- when there are unsaved changes, "Send" button must be disabled
Edited by simevo