Use double quotes consistently

Used throughout MediaWiki, so replacing the single quotes here.

Change-Id: Ib36e5ceb7b4a033f7115d5e969316f1d0fd5b9f4
Localisation updates from http://translatewiki.net.

Change-Id: I4ac25b6fb8f6aacc37dc17592eb1d3b340bc34c5
Adding the common JPY symbol template to the mix.

Change-Id: I35afb4e10d864137233ed5edea8b13526a8698e0
Localisation updates from http://translatewiki.net.

Change-Id: If3f0553e89ef31189e9f4ee23b35ca0509878337