для нормальной работы в конец lang.js пришлось добавить:
,
'email tab': 'Email (BETA)',
/* Custom properties*/
'numeric' : 'Numeric',
'boolean' : 'Boolean',
'list' : 'List',
'values comma separated': 'Values (comma separated)',
'default value' : 'Значение по умолчанию',
'checked': 'Checked?',
'required' : 'Обязательно?',
'multiple values' : 'Множественный выбор?',
'visible by default' : 'Видно по умолчанию?',
'add custom property' : 'Add custom property',
'delete custom property confirmation': 'Are you sure you want to delete the custom property?',
'undo': 'Undo',
'confirm discard changes': 'Discard changes?',
'custom property deleted': 'This custom property and all its values are going to be deleted',
'custom property name empty': 'Custom property names cannot be empty',
'custom property values empty': 'You must enter values for custom property: {0}',
'custom property wrong default value': 'Default value must be one of the comma separated values for custom property: {0}',
'custom property duplicate name': 'Custom properties must have unique names: {0}',
'custom property invalid numeric value': 'Default value must be a number for custom property: {0}',
'value cannot be empty': 'Value cannot be empty',
'value must be numeric': 'Value must be numeric',
'memo': 'Memo',
'add value': 'Add value'