unified "add" menu for lessonbuilder

Additionally, there are several tools that use tool names from tool/src/resources/messages.properties (rather than the tool name in sakai/config/tools.properties or the tool registration file). This means that institutions need to customize the tool name in multiple places, or if even if not customizing the tool names, Lesson Builder does not use the default name (e.g. Mneme is titled "Tasks, Tests and Surveys" not "Assignments, Tests and Surveys" and Samigo is called "Tests and Quizzes" not "Tests & Quizzes".

I think the simplest solution would be to remove the use of tool names in the Lesson Builder Prompts (see attached messages.diff)