PLF-4236: Add Spanish translation into PLF 3.5.7
PLF-4236: Activate Spanish in KS gadgets: Poll, Last Post
KS-4696: Cannot save document in Content Explorer in debug mode

Problem analysis:
	- UIForm constructor is overridden with empty one in wiki project. As the result, in debug mode, server cannot use functions of UIForm from GateIn

Fix description:
	- Remove empty constructor in wiki side to use UIForm object from GateIN
PLF-4236: Fix spelling mistakes in WikiPortlet_fr.properties