[eclass] Enable linguas for Plasma 5.
[kde-frameworks] Add nls manually to IUSE where required.
[kde-frameworks/kwindowsystem] Fix unsatisfiable dep.

Package-Manager: portage-2.2.12
[eclass] Remove KDE_NLS.

All it did was control adding a USE flag (which we can easily do manually in
the few packages it's required) and toggle installing linguas (which is
controlled anyway by LINGUAS).
[net-irc/konversation] Remove nls USE flag which does nothing.

gettext is (more or less) required unconditionally. We need to add extra logic
beyond the scope of the eclass if we want to avoid the dep when no linguas is
being used.

Package-Manager: portage-2.2.12
[kde-frameworks] Remove KDE_NLS which has gone away.
[kde-base/plasma-workspace] New dependencies.

Package-Manager: portage-2.2.12