Many 'Undefined' shown in SuiteCRM

Version 7.8.3
In the website, there’s many “Undefined” shown in such as Studio menu title, shown when saving a new field, shown when click Account, and the server response very slow.
What’s the problem , anybody can tell?

I solved the ‘Undefined’ problem according to https://suitecrm.com/forum/installation-upgrade-help/13693-help-with-permissions-error-7-8-2#45918 .