runner: support for translated keywords

Sergey Katuninrequested to merge
work/sgakerru/runner-translated-keywords into master

Add support for translated keywords for searching.

It’s strange, the problem is quite obvious, but I couldn’t find an existing bug on bugs.kde.org.

So that the search is performed not only using english keywords, but also using the translated ones.

Like it already does in MenuItem::keywords(...).

Also remove soft hyphens in keywords used for searching.

Like here: !247 (merged)

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