Change language/locale, not automatic update

[quongdang]

Hi all,

I have issue with localization. My application have multiple language such as ( en, de, cn...). I already added the directive:

 <md-date-range ng-model="vm.selectedRange" auto-confirm="true" show-template="false"
                            one-panel="true" md-on-select="changeDates()"
                            date-start="vm.selectedRange.dateStart" 
                            date-end="vm.selectedRange.dateEnd">
</md-date-range>

and config in controll as below:

vm.selectedRange = {
            dateStart: moment().startOf('day').subtract(7, 'days').toDate(),
            dateEnd: moment().startOf('day').toDate()
        };

It can display as my expectation, but when I try to change language from en -> de, it doesn't change the labels. It just update after I tried to refresh the page.
Does anyone have suggestion for this issue?

Thank you so much.