SP Simple Portfolio like any other extension includes .ini files which contain all of the English terms we have used. In most cases you have to translate only those two files:

1. language\en-GB\en-GB.com_spsimpleportfolio.ini
2. language\en-GB\en-GB.mod_spsimpleportfolio.ini

In each of them, you will find phrases used on front-end, for example, Show all, Zoom, Watch and View.

Important component phrases:

COM_SPSIMPLEPORTFOLIO_SHOW_ALL="Show All"
 COM_SPSIMPLEPORTFOLIO_ZOOM="Zoom" 
 COM_SPSIMPLEPORTFOLIO_WATCH="Watch"
 COM_SPSIMPLEPORTFOLIO_VIEW="View"

Important module phrases:

MOD_SPSIMPLEPORTFOLIO_SHOW_ALL="Show All"
MOD_SPSIMPLEPORTFOLIO_ZOOM="Zoom"
MOD_SPSIMPLEPORTFOLIO_WATCH="Watch"
MOD_SPSIMPLEPORTFOLIO_VIEW="View"

Translate the strings to your language and save them as with native language prefix and copy to your language folder. For example:

fr-FR.com_spsimpleportfolio.ini |  ru-RU.com_spsimpleportfolio.ini
es-ES.com_spsimpleportfolio.ini | nl-NL.com_spsimpleportfolio.ini

This same for module language file: fr-FR.mod_spsimpleportfolio.ini or es-ES.mod_spsimpleportfolio.ini.

File (.ini) must be saved as UTF-8 without BOM encoding. Once the phrases inside file have been translated, copy your language files into your language directory using an FTP client.

Alternative method:

You can translate selected phrases also using the overrides feature in Joomla: Extensions > Language Manager > Overrides tab.