No more localized Wikipedia search engines

In 1.2~rc1, I don’t see any localized Wikipedia search engine in the browser anymore. I guess they were shipped as part of the Iceweasel package’s delta. Maybe it’s acceptable to have this regression, but IMO we should first investigate how hard it would be to get these back in some way (e.g. by pulling them from iceweasel’s Git at ISO build time).

Feature Branch: bugfix/8037-install-localized-wikipedia-searchplugins

Parent Task: #7953 (closed)

Related issues

Related to #8036 (closed)
Related to #8139 (closed)

Original created by @intrigeri on 8037 (Redmine)

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