The language file defines which message should be used by the actions.
The file can be found under
Instead, it is recommended to use overrides. Overrides allow you to customise the default variables with your own values such that they will be preserved through the update process.
To use your own texts, copy the file lang.php into the folder override and then edit the texts as desired.
The texts contain 2 words, which are replaced by the module:
You should keep these dynamic variables, otherwise you will not get any information about which user the information relates to.