Merge of "in-portal/releases/5.2.1-B1@15627" to "in-portal/branches/5.3.x@15659".
Fixes INP-1505 - Restore e-mail template translation sync code removed during merge
Fixes INP-1251 - Add support for using jQueryUI Autocomplete
Fixes INP-1223 - Asynchronous e-mail sending by default
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