Don't cut off name when creating source collection (BL-733)

Cut off was caused by BetterLabel which was to high, overlapping
the text box. We don't really need a BetterLabel here, so I
replaced it with a regular Label control.

Also anchored the text box and the HTML label that shows the path
to the right so that the full width of the window gets used.
Merge pull request #193 from ermshiperete/BL-733

Don't cut off name when creating source collection (BL-733)