Czech image transfer string fix
Update spanish translations
Merge pull request #797 from kruks23/translation

Update spanish translations
Merge pull request #794 from svetlemodry/development

Czech image transfer string fix
inject ui callback into running mam query
fixed another break continue bug
don't include empty fingerprints in list of otrfingerprints
more null checks for otr fingerprints
Initial XEP-0191 support functions
Add unblock logic
Add block/unblock context menu item
Make sure block list is fetched after features
Fix unblock dialog message
Add block/unblock menu to conversation

Add ability to set a callback on all block/unblock methods
Add snackbar for blocked contacts
Add dynamic tag for blocked contacts

Add missing OnBlocklistChanged callback interface
Unblock contact by clicking on the `blocked' tag
Hide snackbar button while waiting on blocking

Make sure options menu gets updated
Retab all files touched by the XEP-0191 impl.
Cleanup tag creation