Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix contents after translators review.
    
    Change-Id: I3bd4a18872f9634de245503f239d777fcb66ec87
    Reviewed-on: https://gerrit.libreoffice.org/64809
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ d9670753

-Subproject commit 65c0841d7745c2c34803f19129802dafb6311379
+Subproject commit d9670753a90271584daa7d8e4aed441b74349f1f