tdf#106175 Support <sub> tag in localized help text as well

Change-Id: If038daf4350bfcd2e7146809f63ee4f062a0dc81
Reviewed-on: https://gerrit.libreoffice.org/38670Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

l10ntools/source/xmlparse.cxx

@@ -1064,11 +1064,11 @@ icu::UnicodeString lcl_QuotRange(
 
 bool lcl_isTag( const icu::UnicodeString& rString )
 {
-    static const int nSize = 13;
+    static const int nSize = 14;
     static const icu::UnicodeString vTags[nSize] = {
         "ahelp", "link", "item", "emph", "defaultinline",
         "switchinline", "caseinline", "variable",
-        "bookmark_value", "image", "embedvar", "alt", "sup" };
+        "bookmark_value", "image", "embedvar", "alt", "sup", "sub" };
 
     for( int nIndex = 0; nIndex < nSize; ++nIndex )
     {