Merge pull request #1 from Joomla-Bible-Study/development

Development merge in Joomla-Bible-Study
Merge pull request #2 from Joomla-Bible-Study/development

fetch most recent changes
Merge pull request #3 from Joomla-Bible-Study/development

merge in common development branch
merge language files of site and admin
'merged' pull request conflict

Conflict happened by working on install file biblestudy.xml in parallel.
Simply use file on 'main' branch
Merge pull request #393 from st-anton/development

Merge the admin and site language files
I'm not absolutely sure, whether this works as I expect: Simply use the biblestudy.xml from 'main' development branch and use all the language files from mine