[Resolved] Switching content languages / language codes to corresponding language

Problem:
The client installed WPML for a bilingual website (Croatian and English), but the default language was incorrectly set as English, causing the English content to appear under the Croatian extension (/hr) and vice versa. Additionally, the client attempted to manually switch language codes and flags, which partially resolved the issue, but the English content still appeared under the wrong extension (/hr instead of /en).

Solution:
We advised against changing the main language of the site due to potential data loss and complications. Instead, we recommended restoring the site to a state before these changes were made to properly assess and correct the settings. This should be done in a staging environment to avoid further issues. We corrected the flags and language names to ensure they match the correct languages. We also confirmed that the client used the Classic Translation Editor (CTE) and noted that if switching to the Advanced Translation Editor (ATE) is necessary, all content must be retranslated as the editors are not interchangeable.

If this solution does not resolve your issue or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If problems persist, please open a new support ticket at WPML support forum.