Improve formatting of search area in case of HTML export

Description

In case of HTML export the users can not format the search area, while Content Exporter doesn't add the custom stylesheet to the search.html file.
We also need to add some classes to the generated list to make it formatable.

Environment

None

Status

Assignee

András Németh

Reporter

András Németh

Labels

None

Access to limited visibility issues

None

Product platform

Server
Data Center
Cloud

Time tracking

4h

Affects versions

4.12.0

Priority

Major
Configure