added SvtLanguageTable::AddLanguageTag()

Change-Id: Ic8be508bff3767f2f8ab1146447b3fe4bffff3b3

include/svtools/langtab.hxx

@@ -40,6 +40,14 @@ public:
                       parameter.
      */
     static OUString     GetLanguageString( const LanguageType eType, bool bUserInterfaceSelection );
+
+    /** Add a language tag to the table.
+
+        @param  rString
+                UI visible description string. If empty, the rLanguageTag Bcp47
+                string is used instead.
+     */
+    static sal_uInt32   AddLanguageTag( const LanguageTag& rLanguageTag, const OUString& rString );
 };
 
 // Add LRE or RLE embedding characters to the string based on the

svtools/source/misc/langtab.cxx

@@ -227,5 +227,10 @@ LanguageType SvtLanguageTable::GetLanguageTypeAtIndex( sal_uInt32 nIndex )
 }
 
 
+sal_uInt32 SvtLanguageTable::AddLanguageTag( const LanguageTag& rLanguageTag, const OUString& rString )
+{
+    return theLanguageTable::get().AddItem( (rString.isEmpty() ? rLanguageTag.getBcp47() : rString),
+            rLanguageTag.getLanguageType());
+}
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */