Update git submodules

Update git submodules

* Update helpcontent2 from branch 'master'
  to 7e42394ecbf921ee53160b495aa12c1cba158604
  - tdf#152323 drop name attribute from <link> elements

    Replacement done with

    find . -name \*.xhp -print0 |xargs -0 -P 0 perl -CS -pi -e \
            's#(<link[^>]*?) +name *="[^"]*" *( [^>]+|) *>#$1$2>#g'

    (note some inconsistencies with space between name and = and also having
    empty value, and some more complicated expression to also clear up
    double space before/after the attribute)

    translation files will be prepped with:

    find */helpcontent2 -name \*.po -print0 |xargs -0 -P 0 perl -CS -pi -e \
        $'s#(<link[^>]*?) +name=(?:\\\\"[^"]*\\\\"|\'[^\']*\') *( [^>]+|) *(/?>)#$1$2$3#g unless /^#/'

    (note that not all languages use the " as quote character for the
    attributes, but that also single quotes appera in the po file. Hence
    the use of the shell $'string' syntax to be able to quote ' as \'
    It also requires to quote the backslash, so that it needs to be escaped
    once for the shell, then another time for perl. Also don't work on
    obsolete strings (those are prefixed with #~ in the po files)
    Also note that <link..></link> gets turned into <link ../> during
    translation extraction (along with removal of the space between the
    attribute name and the value), so the pattern needs to be slightly
    different here)

    Change-Id: I95e53a08e6b0095cd894109ea0de154cc4859d8f
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/143713
    Tested-by: Jenkins
    Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>