Improve copy in "Profile" > "Email and Password" section

When an account has a password, replace "Set Password"
button's label with "Change Password"

hc/accounts/tests/test_profile.py

@@ -9,6 +9,7 @@ class ProfileTestCase(BaseTestCase):
 
         r = self.client.get("/accounts/profile/")
         self.assertContains(r, "Email and Password")
+        self.assertContains(r, "Change Password")
 
     def test_leaving_works(self):
         self.client.login(username="bob@example.org", password="password")
@@ -75,3 +76,15 @@ class ProfileTestCase(BaseTestCase):
         self.client.login(username="alice@example.org", password="password")
         r = self.client.get("/accounts/profile/")
         self.assertContains(r, "Alices Key")
+
+    def test_it_handles_unusable_password(self):
+        self.alice.set_unusable_password()
+        self.alice.save()
+
+        # Authenticate using the ProfileBackend and a token:
+        token = self.profile.prepare_token("login")
+        self.client.login(username="alice", token=token)
+
+        r = self.client.get("/accounts/profile/")
+        self.assertContains(r, "Set Password")
+        self.assertNotContains(r, "Change Password")

static/css/profile.css

@@ -65,3 +65,7 @@ span.loading {
 #my-keys th {
     border-top: 0;
 }
+
+.settings-bar {
+    line-height: 34px;
+}

templates/accounts/profile.html

@@ -38,7 +38,7 @@
                 <form method="post">
                     {% csrf_token %}
                     <h2>Email and Password</h2>
-                    <p>
+                    <p class="settings-bar">
                         Your account's email address is
                         <code>{{ request.user.email }}</code>
 
@@ -47,12 +47,21 @@
                             class="btn btn-default pull-right">Change Email</a>
                     </p>
                     <p class="clearfix"></p>
-                    <p>
-                        Attach a password to your {{ site_name }} account
+                    {% if request.user.has_usable_password %}
+                    <p class="settings-bar">
+                        Password authentication is enabled.
+                        <a
+                            href="{% url 'hc-set-password' %}"
+                            class="btn btn-default pull-right">Change Password</a>
+                    </p>
+                    {% else %}
+                    <p class="settings-bar">
+                        Attach a password to your {{ site_name }} account.
                         <a
                             href="{% url 'hc-set-password' %}"
                             class="btn btn-default pull-right">Set Password</a>
                     </p>
+                    {% endif %}
                 </form>
             </div>
             {% if changed_password %}