As a PM, I want the language describing PRU in Preferences to be updated, so that it is clear and intuitive to users.
Note: This work has been partially implemented by Max's work. The purpose of the ticket is to clean up the language.
**Acceptance Criteria:**
* Provide a checkbox under "Email options" that states "Require both email address **and **username to reset password"
* The word "and" should be bold
* There should be sub-text (i.e. help text that is shown inline), which states: "If checked, the password reset email for this account will be sent only when both email address and username are provided in the reset form."
* The user should be able to turn on/off PRU with this checkbox in Preferences
**Visual Example (note that the text in the mock-up is slightly outdated):**
{F30595342}