Unify naming of "Install tool" vs "Admin Tool" vs. "System Tools"
"Install Tool" was renamed to "Admin Tool", see https://docs.typo3.org/m/typo3/guide-installation/master/en-us/In-depth/TheInstallTool/Index.html
The Admin tool was called “Install Tool” in earlier versions, you will likely still see that term in some places.
When logged in, you will see "Admin tool" in the top left.
There are still some places in the core, where install tool is still used. Might avoid confusion if this is cleaned up.
1. Message, when Install tool is locked:
The Install Tool is locked To enable the Install Tool, the file ENABLE_INSTALL_TOOL must be created in the directory typo3conf/. The file must be writable by the web server user. The filename is case-sensitive but the file itself can be empty.
Security note: When you are finished with the Install Tool, you should rename or delete this file. It will automatically be deleted if you log out of the Install Tool or if the file is older than one hour.
2. Don't know if we want to change the filename too ENABLE_INSTALL_TOOL. Might cause more problems than it solves.
3. various places in core
4. Some more occurrences in official docs (e.g. install guide).
Update: See also #88810 which suggests it should rather be named "System Tool" than "Admin Tool"