support for accent folding for API and importer geocoding calls (to better support special chars); compatibility check for Sucuri Security plugin; MapsMarker API: use "MapsMarker API" as createdby & updatedby attribute if not set; Google+Bing language localizations could be broken since WordPress 4.0 as constant WPLANG has been depreciated; Bing culture parameter was ignored and fallback set to en-US when constant WPLANG with hypen was used; updated translation credits