RTL bugs in groupware apps

[hamza221]

Describe the task

Make groupware apps work seamlessly with RTL languages

Affected components

Mail, Calendar

To do

Mail:

• [ ] https://github.com/nextcloud/mail/issues/10222
• [x] https://github.com/nextcloud/mail/issues/10223
• [x] https://github.com/nextcloud/mail/issues/10224
• [x] https://github.com/nextcloud/mail/issues/10225
• [ ] https://github.com/nextcloud/mail/issues/10226
• [x] https://github.com/nextcloud/mail/issues/10228
• [x] https://github.com/nextcloud/mail/issues/10227
• [x] https://github.com/nextcloud/mail/issues/10229

Calendar:

• [x] https://github.com/nextcloud/calendar/issues/6400
• [x] https://github.com/nextcloud/calendar/issues/6401
• [x] https://github.com/nextcloud/calendar/issues/6402
• [x] https://github.com/nextcloud/calendar/issues/6403
• [x] https://github.com/nextcloud/calendar/issues/6404