Modifying the wordings on invoices and receipts

We want to change the predefined text blocks that are used in the invoices and receipts.
Which is the most effective way to find the corresponding definitions?

Simply search for the terms you want to change:
Overview => Settings => Wording and Phrases
If your search terms do not provide the required results, try to enter more words or a whole phrase.

Another way is to use language keys together with phrases to get even better results (see image).

• For invoice enter S_INVOICE and the search term
• For receipts enter S_RECEIPT and the search term

You can find more detailed information here:
Making the keys/codes visible that are used for the phrases of ConfTool Pro