Lots of bug fixes and some small features:

- Fixed database compatibility issue with i18ncontent query by omo, #135387
- Fixed warning with profile fields by bitstream, #129262
- Fixed typo in INSTALL.txt by serkanarikusu, #206172
- Added i18npanels module contributed by JacobSingh, #159926
- Added description to translated items by JacobSingh, #197977
- Rename i18n blocks by incrn8, #246014
- Link to translate node changes site language by Jaza, TBarregren, #149108
- Added "translate own nodes" permission by rblomme, christopher_skauss, #41580
- Fixed synchronization warning on content type by yettyn, #166101
- Applied postgres compatibility patch by ivanSB, #183593
- Added token support for language code by knseibert, #176449