Add help link for 8 more special pages
- Links can now be customised on-wiki via system message: e928d5bdd0fbc63a951ca373aaf68bb1e6bf715c
- Most help pages chosen here are good for any MediaWiki install and have been imported on MediaWiki.org. Their license has been noted in the appropriate template, only future contributions will be in public domain (CC-0) unless we reach old authors. An udpate/discussion was opened at the project talk: https://www.mediawiki.org/wiki/Project_talk:PD_help
- The 6 pages on MediaWiki.org have been marked for translation; import of previous translations is ongoing. 2 pages are left on Meta because importing translatable pages with all translation units may be overkill.