Problem:
When trying to update the plugins, this error is shown: PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature Solution:
go to Dashboard → Updates;
press the Check Again button;
press the Update button at the bottom of the page;
Solution: The client has created posts in each language. So the posts in secondary languages will be individual one as not the translation. It works as expected after the following steps.
1) Open your secondary language Page/Post for edit, then click on *Connect with translations* link of *Language* widget on the right side
2) Search for the newly created Page/Post in the primary language
3) Choose that Page/Post and click on the *Ok* button
4) Uncheck the *Make "Secondary language" the original language for this page* and click on *Assign* button
5) After the *Assign* action, confirm the secondary language Post/Page will become the translation of the selected default language Page/Post or not
Problem:
Can't add or change anything in the translated menu.
Solution:
The database collation for the tables "wp_terms" and "wp_term_taxonomy" needed to be updated.
When WPML works on the menus, it uses data from these tables "wp_posts", "wp_icl_translations", "wp_terms" and "wp_term_taxonomy" so at the client database all the (`varchar` and `longtext`) at the "wp_posts" and the "wp_icl_translations" columns are using the "utf8mb4_unicode_520_ci" collation, but his "wp_terms" and "wp_term_taxonomy" are using "utf8mb4_unicode_ci" and this is making an illegal mix of collation issue, so to fix this issue, we had to change the collation for all the columns to be "utf8mb4_unicode_520_ci" instead of "utf8mb4_unicode_ci".
