[FIXED] #11572 Filter Legend By Map Content doesn't maintain point displacement legend

The fix from https://github.com/qgis/QGIS/pull/1673 has to be enhance to have
 something more generic.

This fix add methods to QgsPointDisplacementRenderer:
* capabilities
* symbolForFeature
* originalSymbolForFeature
* symbolsForFeature
* originalSymbolsForFeature
* willRenderFeature
Merge remote-tracking branch 'rldhont/filter_legend_displacement_point2'

Conflicts:
	src/core/qgsmaphittest.cpp
Add note about QgsMapCanvas::refresh() behavior
[TRANSUP] some fixes and improvements for transifex including renamed and deleted ts files

Signed-off-by: Werner Macho <werner.macho@gmail.com>
add missing ts files (fixes #11662)
Fix QgsSymbolLayerV2 test