Language localization fail

.po file is in languages/ folder. Does that help?

Sorry, my typo.
I meant I have build the .mo file by using poedit, and I have it named in custom-contact-forms-zh_TW.mo.
And I found it only working in the form builder, but still displaying English in the front end.

Which text strings aren’t translatable?

I only translate these strings from Poedit.
https://i.gyazo.com/8418f36dfe7f516fae2a2ac32733473e_1.png

In the Edit Form interface, it seems working.
https://i.gyazo.com/47c9fd92c7238975e7deaa48f239a7f8_1.png

But in the front end, it still displaying in English.
https://i.gyazo.com/a7e92b5ca9318f95bf3861d748959579.png

Then I guess I should have a new date/time element for the form, because I upload .mo file after I built the form. But it is still English.

This will be fixed in the next release.

Thanks:)