There are two "things" in the LTI administration tool. The "External Tools" (stored in lti_tools) and the "Resource Links" (stored in lti_content).
Originally I called these "Tools" and "Content Items" in LTI 2.0.0 because I was focused on Lessons as our new "content-authoring" application. These terms were confusing and so when John and Zhen did the redesign of the Admin tool user interface they came up with new terms for these.
lti_tools became "Tools Available in System" and lti_content became "Tools Added to Sites" in LTI 2.1.0 - while these are better than my original very bad choices of terminology - they are still mis-leading and need to be improved.
The right nomenclature (IMHO) is to follow the terminology in the LTI specification that calls these things "LTI Tools" and "Resource Links".
When we go to LTI 2.0 (
BLTI-230) it will be even more important to get these terms right to have the new LTI 2.0 UI flow fold nicely into the existing user interface.
I figure I will put this nomenclature change into trunk right away instead of the branch to make sure we have lots of time to translate the new text that comes from this change.