2926: Redesign of search feedback in web

[LeandraH]

Short description

This is the implementation of the redesign of the search feedback in web

Proposed changes

• When there are no search results, the text makes it clearer that we also searched in the fallback language, and a suggestion to try a different language.
• When there are no search results, there is a very clear CTA to open the feedback form if the user thinks there is information missing anyway.
• The design also calls for the number of search results to disappear if there aren't any but I decided against that so that a screen reader can still yell at someone to stop typing if they already have no results (IGAPP-886: Announce number of search results in screen reader #2352)

Side effects

• The sad smiley in the search feedback disappears (though I'm not sure that qualifies as a side effect since that's the design)

Testing

You can switch the app to English and search for "alleinerziehend".

Resolved issues

Partially fixes: #2926

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