Edit file extension ts

From scratch TYPO3 don't allow to edit files with file extension "ts" to be edited in the fileadmin of the backend. Allthough it is a good way to hold configuration directives in files with this suffix.

Start the install tool

Go to "all configuration".

Find the key "[SYS][textfile_ext]".

Add "ts" in the field, but with a comma.

Save with "Write to localconf.php".

Reload the fileadmin page.

If necessary flush the cache.

The you can see the edit icon in fileadmin list.