Fix PHP notice from WikiaInteractiveMaps i18n

Fix PHP notices on rebuilding localisation cache in
WikiaInteractiveMaps such as:
Notice: Undefined variable: max in extensions/wikia/WikiaInteractiveMaps
/WikiaInteractiveMaps.i18n.php on line 613

In i18n files, the convention is to prefer single quotes unless you have
single quotes in the string already.

Also, fix what should be a link in one of the translations.
Merge pull request #4468 from Wikia/maps-i18n-notice

Fix PHP notice from WikiaInteractiveMaps i18n