added ResStringArray::AddItem()

Change-Id: I361cd4256c0816a46ea6e37dd9fd2680d3dba9fb
added SvtLanguageTable::AddLanguageTag()

Change-Id: Ic8be508bff3767f2f8ab1146447b3fe4bffff3b3
add on-the-fly language tags to the language table

Change-Id: I5ca9e212374821de425729863c82f7b4699487a7