Add domain name to title of mgmt pages, use vertical bar throughout

src/registrar/templates/application_form.html

@@ -1,7 +1,7 @@
 {% extends 'base.html' %}
 {% load static form_helpers url_helpers %}
 
-{% block title %}Apply for a .gov domain – {{form_titles|get_item:steps.current}}{% endblock %}
+{% block title %}Apply for a .gov domain | {{form_titles|get_item:steps.current}} | {% endblock %}
 {% block content %}
 <div class="grid-container">
   <div class="grid-row grid-gap">

src/registrar/templates/domain_base.html

@@ -1,7 +1,7 @@
 {% extends "base.html" %}
 {% load static %}
 
-{% block title %}Domain {{ domain.name }}{% endblock %}
+{% block title %}Domain: {{ domain.name }} | {% endblock %}
 
 {% block content %}
 <div class="grid-container">

src/registrar/templates/domain_users.html

@@ -1,7 +1,7 @@
 {% extends "domain_base.html" %}
 {% load static %}
 
-{% block title %}User management{% endblock %}
+{% block title %}User management | {{ domain.name }} | {% endblock %}
 
 {% block domain_content %}
   <h1>User management</h1>