Update git submodules

* Update helpcontent2 from branch 'master'
  - Mute unnecessary translations in fiter names
    
    Changed to allow translation of filter names and media types
    Removed randomness for paragraph ids to spare retranslation
    
    Change-Id: If73d4799537b2d91ec9fe58584033b46eeeb9e04
    Reviewed-on: https://gerrit.libreoffice.org/70671
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 6b3fde1a

-Subproject commit 0c1a7eba29b4819f15482fa694ed70ab398de74b
+Subproject commit 6b3fde1a622298ca05027892d395b3c1f5acdcb9