How can I search for key words in all scripts at once

You can search through scripts in %ARISHOME71%\server\templates\scriptservice\, e.g. in an editor. You only will find only filesnames with a GUID, GUID.script is the real script; the name of the script is to be found in the corresponding GUID_en.loc (or other language than "en") file.

But be aware that most of the standard scripts are locked, en can't be opened any way.

Succes!, regards, Ariene