MacOS has a feature where it can automatically replace text you type with a different phrase. This is configured on a system-wide level in the keyboard preferences, and applies to all text fields.
For example, you can instruct it to change "wkr" to "With kind regards", or even multi-line replacements for any phrase you instruct it to.
This is very useful for greetings, signatures, and any common phrase you use in your daily business.
When typing out a message within Kagi Translate, I would expect these text replacements to work in the way it does in the rest of MacOS, but for some reason they do not function within Kagi. That could be because the OS doesn't understand that this is a text field? It is very rare for the text replacements to not work.