Update Russian translation

_locales/ru/messages.json

@@ -1008,7 +1008,7 @@
 		"description": "Title of the button 'Print the page' in the editor"
 	},
 	"editorImportMht": {
-		"message": "Import MHTML file",
+		"message": "Импорт MHTML-файла",
 		"description": "Title of the button 'Import MHTML file' in the editor"
 	},
 	"pendingsTitle": {
@@ -1127,4 +1127,4 @@
 		"message": "Неправильный JSON",
 		"description": "Options editor error message: 'Invalid JSON'"
 	}
-}
+}