When a new theme version is released/updated, the translation .po must be updated as well to find the new terms added in the latest theme wpresidence.po. You can read more here – http://www.marketpressthemes.com/blog/how-to-merge-two-po-files-using-poedit/
Step #1 – Open up your existing language PO file with Poedit software.
Step #2 – Go to
Update from POT file
Step #3 – First, change the file type option to
All Files, then select the new wpresidence.po PO file from latest theme update folder
Step #4 – Once the import is completed, all the new string from the new PO file will be added and your existing (translated) string will remain intact as well.
Step #5 – Finally, proceed to translate all the new string into your preferred language. Save. Move the updated .po and .mo language file back to wpresidence/languages or to child theme languages folder.