Skosmos 2.16.1

This is a minor patch release (2.16.1) of Skosmos which contains some bug fixes as well as updated UI translations for German and Northern Sámi languages.

Bug fixes

• #1377/#1383 Opening the hierarchy for a concept takes a long time
• #1423 Fix conversion of DateTime to string in getContainsHtml
• #1408/#1409 Don't crash on incomplete vocabulary configuration (credit: @nichtich)

Translation updates

• #1424 Update German translations (by @schlawiner & @nichtich)
• #1424 update Northern Sámi translations (by @mariguttorm & @nikopartanen)

See the upgrade instructions in the wiki for information about upgrading from earlier versions.