ok, so it as linked with pattern match with jme edtor question type. We removed it as it was only installed for testing.
tried the customisation again, it now stopped with "error writing to database error"
This is what I get with debug on:
Debug info:
Stack trace:
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line 410 of /lib/dml/moodle_database.php: dml_write_exception thrown
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line 1028 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
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line 1070 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->insert_record_raw()
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line 190 of /admin/tool/customlang/locallib.php: call to mysqli_native_moodle_database->insert_record()
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line 60 of /admin/tool/customlang/index.php: call to tool_customlang_utils::checkout()