Bug 7445 - Clicking on a tag gives "Language ... does not exist"

Bug 7445 - Clicking on a tag gives "Language ... does not exist"

To test:
- Syspref QueryStemming = Try
- Install Norwegian bokmål:
  cd misc/translator/
  perl translate install nb-NO
- Go to Home › Administration › System Preferences > I18N/L10N
  and enable "Norsk bokmål(nb-NO)" for opaclanguages as well as
  setting opaclanguagesdisplay = Allow
- Make sure you have selected "Norsk bokmål" as the active language
  in the OPAC
- Find a record that has a tag (which does not contain any digits)
- Click on the tag and see that you get the error in the title of
  this bug
- Apply the patch
- Click on the tag again and the error should be gone

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Easy to test with a great test plan. Works nicely.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>