Bug 15306: Do not display the translate link if only 1 language is installed

Bug 15306: Do not display the translate link if only 1 language is installed

It doesn't make sense to offer the option to translate an item type
description into another language if there is only one language
installed.

Test plan:
Generates templates for only 1 language
Edit an item type and confirm that the link "translate into..." is not
displayed.
Generates templates for another language
Confirm that the link is now displayed.

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com