Edited Unassigned: MaskedEditExtender autoComplete property typo [27969]

As-of the most recent build (commit b728757c3209), an exception is thrown when the MaskedEditExtender's autoComplete property is used, causing the element to fail to load. The client-side error is "Sys.InvalidOperationException: 'autoСomplete' is not a property or an existing field." - ScriptResource.axd (3747,65). This traces back to the MaskedEditExtender.cs file with the line [ClientPropertyName("autoСomplete")]. Apparently, the Cyrillic character С is used instead of the English "C". Once the substitution is made the error goes away.

Fixing this error results in a couple of deprecation warnings for the functions get_UserDateFormat (MaskedEdit.js 2501 & 2502) and get_CultureDatePlaceholder (MaskedEdit.js 2492 & 2500) to be renamed to lowercase "user" and "culture", respectively.

Thanks for all the great work!