Update git submodules

* Update helpcontent2 from branch 'master'
  - Show module & lang navigation on mobile
    
    Module & languages menus were not shown on screen widths < 960.
    
    Changed module & languages menu background to span the whole
    width, when on mobile.
    
    An arrow function was used in help2.js, which means it was broken
    on IE.
    
    Moved all src .js files to head and used defer for all.
    
    Moved inline Piwik & system info JS into help2.js and added a
    test for onlineness targeting the first meta element in the body.
    
    Change-Id: Ic1a928b53ce9029f9f655117977cd511b7e3246d
    Reviewed-on: https://gerrit.libreoffice.org/69005
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 54e32367

-Subproject commit 3013fcc8dd2ca6407c6bf17a36a34741d0c9c968
+Subproject commit 54e3236790baca8a55d0bea3b1dd3e8de5ec5dd5