Bio settings page: add a short explanation

tildes/tildes/templates/settings_bio.jinja2

@@ -10,6 +10,10 @@
 {% block main_heading %}Edit your user bio{% endblock %}
 
 {% block settings %}
+  <p>Enter a bio that others will be able to view on your user page (maximum {{ bio_max_length }} characters). To remove your bio, set it to blank.</p>
+
+  <div class="divider"></div>
+
   <form
     method="post"
     name="user-bio"
@@ -20,7 +24,7 @@
     {{ markdown_textarea('User Bio (Markdown)', text=request.user.bio_markdown) }}
 
     <div class="form-buttons">
-      <button type="submit" class="btn btn-primary">Submit</button>
+      <button type="submit" class="btn btn-primary">Save bio</button>
     </div>
   </form>
 {% endblock %}

tildes/tildes/views/settings.py

@@ -14,7 +14,11 @@ import qrcode
 from webargs.pyramidparser import use_kwargs
 
 from tildes.lib.string import separate_string
-from tildes.schemas.user import EMAIL_ADDRESS_NOTE_MAX_LENGTH, UserSchema
+from tildes.schemas.user import (
+    BIO_MAX_LENGTH,
+    EMAIL_ADDRESS_NOTE_MAX_LENGTH,
+    UserSchema,
+)
 
 
 PASSWORD_FIELD = UserSchema(only=("password",)).fields["password"]
@@ -113,7 +117,7 @@ def get_settings_two_factor_qr_code(request: Request) -> Response:
 def get_settings_bio(request: Request) -> dict:
     """Generate the user bio settings page."""
     # pylint: disable=unused-argument
-    return {}
+    return {"bio_max_length": BIO_MAX_LENGTH}
 
 
 @view_config(route_name="settings_password_change", request_method="POST")