This thread is resolved. Here is a description of the problem and solution.
Problem: After installed WPML, I keep crash when update my pages, widgets and so on. I would like to add the WPML site key when click the button save then stuck loading. When I click string translation and the website goes to ERR_EMPTY_RESPONSE error.
Solution: This issue might be caused by:
- a low memory limit; make sure that the minimum requirement mentioned here are met: https://wpml.org/home/minimum-requirements/
- a plugin (or even the theme) that you're using might be causing this. In this, try to deactivate all the plugin except WPML, activate a default theme (like Twenty Nineteen), and see if the issue is still available.
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