FWNX-1218: Add Scrollbars to Chose Lang Project Dialog

Remove a hack to work around FWNX-606 (reading ColumnSpan from
a resx; seems to be resolved); vertical scrollbar now appears.
Add horizontal scroll bar (shows only in Windows, unfortunately).

Change-Id: Iea2be8f17c65495f4ed1a4d322afce7c92fe995b