Update git submodules

* Update helpcontent2 from branch 'master'
  to af2f7973d5fc5bbf5cd99cc02a450783d34096ea
  - tdf#166353 Simplify getting current language, don't use en-US fallback
    
    As en-US might not be installed offline, this was not a working approach.
    
    The XSLT to HTML generator makes sure the html element has a language
    attribute, so just read that.
    
    Change-Id: I2b2857ac7ddd5e056ebb7fbb74f782abf58ed229
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/185211
    Reviewed-by: Olivier Hallot <[email protected]>
    Tested-by: Olivier Hallot <[email protected]>
    Tested-by: Jenkins
    
diff --git a/helpcontent2 b/helpcontent2
index 3b9dbce..af2f797 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 3b9dbcec0f18073dd622b6f759ec154695abc51e
Subproject commit af2f7973d5fc5bbf5cd99cc02a450783d34096ea