Dev: update datetimepicker to ver. 1.4.3

Dev: bug fixes and adds another language
Updated translation: Catalan by valdomir
Updated translation: German by actxcellence
Updated translation: Spanish (Spain) by valdomir
Updated translation: Norwegian (Bokmål) by pmonstad
Updated translation: Norwegian (Nynorsk) by pmonstad
Updated translation: Swedish by maxzomborszki
Merge pull request #6 from LimeSurvey/master

Merge with Upstream