Issue Summary

When using the h6 header size on a Rich Text gadget, all the text in the header will be converted to upper-case.

Steps to Reproduce

1. Add the Rich Text gadget to a dashboard
2. Add a h6 size header with its text in lower-case
3. Save the changes

Expected Results

The text will be displayed in lower-case:

Actual Results

The text will be displayed in upper-case:

Workaround

It seems to affect only the h6 header size. Any other header size from h1 to h5 works fine.