I think that you can do it like this:
1. in this directory jira_home\atlassian-jira\WEB-INF\lib
2. decompress the jar file that you want (luanguage used) example language_en_US.jar
3. in this file .proprties language_en_US\com\atlassian\jira\web\action\JiraWebActionSupport_en_US.properties, make your changes
Projects =Tickets and Issues with Tasks (all key with values projects and issues)
4. compress this file and replace the old file with the new file (with changes changes)
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