This thread is resolved. Here is a description of the problem and solution.
When I install Translation Management I get this error:
Fatal error: Uncaught Error: Class 'WCCP_Settings' not found in /homepages/2/d604803240/htdocs/wp-content/plugins/woo-confirmation-page/includes/class-wccp-localization.php:67 Stack trace: #0 /homepages/2/d604803240/htdocs/wp-content/plugins/woo-confirmation-page/woo-confirmation-page.php(61): WCCP_Localization::_set_strings_to_translate() #1 /homepages/2/d604803240/htdocs/wp-includes/class-wp-hook.php(286): WCCP->init('') #2 /homepages/2/d604803240/htdocs/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)
It was another plugin causing incompatibility.
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