0.21.6.1112 beta

Seems to be the last critical crash being killed.

- Resolved crash that happened randomly on Android versions below 6.0 (usually while the app was in the background)
- Fixed: non-bold text in dropdown header's swipe menu after changing language
- Fixed: non-visible dropdown header's swipe menu items can be selected
- Increased min-width for header's swipe menu, improved position calculation

Please make sure to be up-to-date, as it helps much with a stable release. TLDR plan: regular bugfixes -> some little features in between to not get too bored -> feedback -> stable.