templates: Update `reset_done.html` page text and title.

Updates the text and title used when the password reset done page
to work for situations where the user is resetting a forgotten
password and for situation where the user is setting a password
for the first time (e.g. SSO login, demo organizations).

templates/zerver/reset_done.html

@@ -1,7 +1,7 @@
 {% extends "zerver/portico_signup.html" %}
 
 {% block title %}
-<title>{{ _("Password successfully reset") }} | Zulip</title>
+<title>{{ _(" New password successfully set") }} | Zulip</title>
 {% endblock %}
 
 {% block portico_content %}
@@ -10,7 +10,7 @@
         <div class="inline-block">
 
             <div class="get-started">
-                <h1>{{ _("We've reset your password!") }}</h1>
+                <h1>{{ _("You've set a new password!") }}</h1>
             </div>
 
             <div class="white-box">

zerver/tests/test_signup.py

@@ -772,7 +772,7 @@ class PasswordResetTest(ZulipTestCase):
         self.assert_in_success_response(["Check your email"], result)
 
         result = self.client_get("/accounts/password/done/")
-        self.assert_in_success_response(["We've reset your password!"], result)
+        self.assert_in_success_response(["You've set a new password!"], result)
 
         result = self.client_get("/accounts/send_confirm/?email=alice@example.com")
         self.assert_in_success_response(["/accounts/home/"], result)