[Modules] Allow users to resize Text Header items

Problem statement:

The Text Header module item is often used by faculty members to provide quick, additional information to users, and not always as a sub-header for the module. Because of this, the size of the text is often disproportionate - the Text Header items have a font size larger than that of the assignment/page titles that are displayed on other items in the module. Further, the indenting of a text header also does not resize the header text, resulting in visually confusing structure to the modules.

Proposed solution:

Allow users to resize the Text Header module item font size. This will allow the design of the module to best represent instructors desire, and provide a better visual experience for learners where the Text Headers do not overwhelm the rest of the module.

User role(s):

admin