Make small improvements and bug fixes

• Add sender context when a realtor/borrower shares the mobile app with someone
• Improved email templates to have proper padding consistently
• Add a max character length to logged in user's names in the nav bar to keep from styling breaking with longer names
• Added support to display loan source for all source categories (used to only support a limited set of users)
• Add field validation to the custom website dropdown on a loan officer's profile to keep from things being left in a broken state
• Add a max character length to assigned loan officer's names in the loans list to keep from styling breaking with longer names

• Fixed an issue causing there not to be a subject line in the public portal contact form email
• Fixed a small typo where "Milestones" displayed as "Milestone" on the loans list
• Fixed a small styling issue where the conditions engine modal wouldn't reset its state when closed