Add 'from_name' field to SMTP settings and update email sending logic

- Introduced a new 'from_name' field in the SMTP settings to allow users to specify a sender name.
- Updated the dashboard template to include an input for the sender name.
- Modified the email sending logic to format the 'From' header with the sender name if provided, enhancing email presentation.

app/templates/dashboard.html

@@ -253,6 +253,9 @@
                             <input type="password" name="password" value="{{ smtp.password }}">
                         </label>
                     </div>
+                    <label>Absender-Name
+                        <input type="text" name="from_name" value="{{ smtp.from_name }}" placeholder="Thomas-Krenn Wiki-Team">
+                    </label>
                     <div class="form-row">
                         <label>Absender E-Mail
                             <input type="email" name="from_email" value="{{ smtp.from_email }}">