if you are using an Advanced translation editor / automatic translation then the best way would be to add this text as a glossary item. That way when translating, WPML will use the translation you manually added for this string in the glossary.
It seems that the screenshot is not updated on the doc page, I asked our docs team to update it. Sorry for the inconvenience!
Regarding your question about adding Glossary items globally, you can add them in WPML > Translation Management > Automatic Translation > Glossary tab (Kindly check the attached screenshot).
Please note that glossary items are case-sensitive, and the term must match exactly what is defined in the glossary to apply the translation.
The "Tools" tab appears on the doc page will be available in the next release WPML 4.6 (It should be released for all clients soon and you can install it manually from here https://wpml.org/account/downloads/), at the moment you can find the Glossary with the steps I shared in my previous message.
