Creating Language Overrides
Quite often, we received requests about modifying language string constants. Most of the time, users are unaware that modifying the language files directly is pretty pointless because when the extension get's updated, the changes will be reverted and it also doesn't make sense to do a backup of the changes all the time.
However, since Joomla! 1.6 onwards, users are actually able to create language string constant override through the new implemented feature in Joomla!. It doesn't need much technical knowledge at all.
Manually Create Overrides Files
You will need to manually create override file on path below and include those necessary translations in those files.
Frontend Language Files
Your_Site_Path/language/overrides/en-GB.override.iniBackend Language Files
Your_Site_Path/administrator/language/overrides/en-GB.override.ini
Please note that you should name your files based on which language you overriding with. For example, in case you are doing language override for Französisch language, then those file name are fr-Fr.Overrides.ini.
Create Overrides Using Joomla Language Section
Refer Joomla's documentation