[Resolved] Vietnamese language codes of WPML and other plugins are not consistent

Problem:
The client reported that the Vietnamese language code in WPML is set to

vi_VN

, while WordPress and all other plugins use

vi

. This discrepancy causes automatically loaded translations for plugins not to appear on Vietnamese pages.
Solution:
We acknowledged the issue and informed the client that we are aware of the mismatch and are working to resolve it. The default locale will eventually be set to

vi

, as recommended by WordPress. In the meantime, we advised the client to avoid renaming .po/.mo files in plugin directories, as these changes would be lost on the next update. Instead, we suggested going to WPML->Languages->Edit languages and changing the default locale from

vi_VN

to

vi

.
We also mentioned that this fix is included in our release log for upcoming updates, but we could not provide an estimated time of arrival.

Please note that this solution might be outdated or not applicable to your case. If the issue persists, we highly recommend checking related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If you still need assistance, please open a new support ticket.