- Add missing find_lang macros for additional translations

- Add KArchive to BuildRequires and bump Frameworks versions
(they were lower than in kdevplatform, and that did not make
any sense)

- New upstream release 5.0.1
* Do not display the "project is already open in a different
session" dialog on starting up a session under some
circumstances.
* Mouseover highlight now uses the "Search highlight" color from
the configuration dialog, instead of a hard-coded bright
yellow.
* Fix working directory of Custom Makefile plugin
* Fix a possible crash on triggering an assistant popup action
* Fix a freeze under some circumstances when the welcome page is
displayed.