Sorry. The problem is that there are more language keys which speaks about "Title".
There are 2 possibilities to change the language.
1) go to administrator/components/com_jem/language/en-GB/en-GB.com_jem.ini, search for "Title" and replace it with e.g. "Band". Make the same components/com_jem/language/en-GB/en-GB.com_jem.ini.
The problem will be, if you update the language, you have to redo again.
2) Search the key in the above files, but go to language/overrides and enter the override name for the keys.
(if you have problems search in the help or joomla help for language overrides.
Testing JEM 2.3.0 beta3 local on clean latest Joomla (3.9.11) Protostar php7.3.8 (no mails)