Phrases for translation used on front-end are here:
- language\en-GB\en-GB.com_splms.ini
- language\en-GB\en-GB.mod_splmscart.ini
- language\en-GB\en-GB.mod_splmscourses.ini
- language\en-GB\en-GB.mod_splmscoursescategegory.ini
- language\en-GB\en-GB.mod_splmscoursesearch.ini
- language\en-GB\en-GB.mod_splmspersons.ini
- language\en-GB\en-GB.mod_splmsupcomingevents.ini
Some phrases may be also in template language file.
and for back-end:
administrator\language\en-GB\en-GB.com_splms.ini
You can copy those file(s) and rename to your language code, for example:
de-DE\de-DE.com_splms.ini
then translate inside all phrases or only selected.
You can also use Joomla Language Override system to translate only selected phrases as well.