some strings to localize external mount api responses. fix #8094
search term for users and groups may occur anywhere in the name or displayname, not just in the beginning
add tests
return int, not string
clean up created groups after testing, and correct parameter order
extend Dummy user and group implementation to pass tests
Fix test mail behaviour

* ref #8854
* prevent default of "send test mail" button
* drop unused form serialization
* use display name of user for test mail
shorten userid columns to 64 chars, ref #9186
Use file_source to find matching share for nested link shares
Unit tests for share dropdown with nested link share
fix trailing whitespace noted by Scrutinizer
always regenerate etag when writing back file to objectstore
specify no attribute for group exists check, as done with users
fix instantiation of Access class
also adapt result check from readAttribute
normalize path before comparison to make sure that we always find the mount point
check if file exists before deleting keys, and add debug output for every
delete operation
unit tests
Merge pull request #9264 from owncloud/share-linkshareusefilesource

Use file_source to find matching share for nested link shares
fix server share dialog title