... as it causes problems on Windows:

file:///C:/lo/core/solver/wntmsci12.pro/share/liblangtag%5Clanguage-subtag-registry.xml:709: parser error : Input is not proper UTF-8, indicate encoding !
Bytes: 0xE5 0x6C 0x3C 0x2F
     <description>Norwegian Bokmål</description>

Apart from the encoding issue (looks like that language-subtag-registry.xml
delivered from module liblangtag is generated as MS-1252 rather than UTF-8 on
Windows), what also looks worrying in the error message is the backslash encoded
as %5C (and the entity resolving that URL apparently decoding it somewhat
naively).

Change-Id: I756f911a92b144e3732f63668d36b4ae941f975a