Text encoding converts apostrophes to ‘’’

[Rumperuu]

Right single quotation marks (i.e., the ’ character) have been mis-encoded as ‘’’ in the file class/dashboard/subpage-main.php. This affects the tooltips displayed on the Plugin settings dashboard.

This appears to have been introduced all the way back in 2.1.0 — I'm not sure how we haven't noticed it until now.

I suspect there may be some sort of underlying file encoding mismatch issue that will be worth looking into later, but for now #78 should fix the immediate problem.