* Translation fix
* Polishing of Button layout. It fits into space better, not leaving
hanging space in edges. With a lot of buttons it reduces sizes of
buttons.
* A lot of code cleanup (automatic Organize Imports on full project)
* remove unneeded casts
* revert debug colors
+ Edit property after addition - click on marker in a list and it will
show a window
* do not start timer and stop recording when showeing record window for
a second time
* slight rework of external files handling: a new MarkerWithExternals
class that deletes external file when requested. Deleting a marker from
list causes file deletion.