All of our Joomla software uses Joomla's standard language API for translations. We didn't reinvent the wheel. So, you need to do standard Joomla stuff to translate it in a different language.
Assuming “French (France)” as your language (as opposed to “French (Canada)”, for example).
Joomla 3: Copy administrator/language/en-GB/en-GB.com_admintools.ini to administrator/language/fr-FR/fr-FR.com_admintools.ini
Joomla 4: Copy administrator/language/en-GB/com_admintools.ini to administrator/language/fr-FR/com_admintools.ini
Note that the difference between Joomla 3 and 4 is whether the file also has the language tag (fr-FR) as part of its name.
Translate the copied file and make sure it's a valid INI file. Joomla will not load the entire language if even one line has an error.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!