Add ability to create bans from reports

This is done in the admin view and opens a new iframed window. The ban
form is pretty barebones and doesn't have full functionality yet, but
that is coming.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/templates/board/ban_form.html

@@ -0,0 +1,50 @@
+{% extends "board/base.html" %}
+{% load i18n %}
+
+{% block content %}
+<form id="form" action="{% url 'board:ban_create' url=board.url id=post.id %}" method="post"> 
+    {% csrf_token %}
+    <table>
+        <tr>
+            <th>{% translate 'Post ID' %}:</th>
+            <td>{{post.id}}</td>
+        </tr>
+        <tr>
+            <th>{% translate 'Board' %}:</th>
+            <td>{{board.url}}</td>
+        </tr>
+        <tr>
+            <th>IP:</th>
+            <td>{{post.ip}}</td>
+        </tr>
+        {{form.as_table}}
+        <tr>
+            <th>{% translate "Previous bans" %}</th>
+            <td>{{previous_bans|length}}</td>
+        </tr>
+        <tr>
+            <th>{% translate "Current bans" %}</th>
+            <td id="current_bans">{{current_bans|length}}</td>
+        </tr>
+        <tr>
+            <th></th>
+            <td><input type="submit" id="submit" value="{% translate 'Create ban' %}" /></td>
+        </tr>
+    </table>
+</form>
+
+<script>
+function submitConfirm(e) {
+    console.log($("#current_bans").text());
+    if($("#current_bans").text() !== '0') {
+        let result = window.confirm("There is already at least one ban for this IP address on this board, are you sure you want to continue?");
+        if (!result) {
+            e.preventDefault();
+            return;
+        }
+    }
+}
+
+$("#submit").on("click", submitConfirm);
+</script>
+{% endblock content %}

board/templates/board/ban_success.html

@@ -0,0 +1,29 @@
+{% extends "board/base.html" %}
+{% load l10n %}
+{# Title #}
+{% block title %}{% localize on %}Ban success{% endlocalize %}{% endblock %}
+{# Body #}
+{% block content %}
+<div class="row" id="message">
+    {% localize on %}A ban has been created. This window will close in 1 second.{% endlocalize %}
+</div>
+
+<script>
+function isIframe() {
+    try {
+        return window.self !== window.top;
+    } catch (_) {
+        return true;
+    }
+}
+
+setTimeout(function() {
+    if(isIframe()) {
+        window.top.banWindow.close();
+    } else {
+        window.close();
+    }
+}, 1000);
+
+</script>
+{% endblock %}