Added German Translations (#406)

* Added German Translations

Translated using
https://docs.djangoproject.com/en/1.9/topics/i18n/translation/

Added language drop down menu's for base.html, registration & login
pages

Known issues:
* Translated items in whtracker>create signature remain translated when
posted
* No date/time localisation for Fleet/Structure timers

* Added time locale

Added date/time locale to
*Structure Timers
*Fleet Timers
*Fleet timer form datetimepicker.js

Fixed a bug where the bootstrap label didn't show up when making a
structure timer using the translated form

Missed some base.html translations

* Small translation error

Some obscure SRP strings went unnoticed for context review

* FAT & Fleet-up German Translations

+ a fix in settings.py.example

The only small thing not done is German Date/Time locale for Fleet-up

* Compiled de/django.po

stock/templates/registered/groups.html

@@ -1,21 +1,22 @@
 {% extends "public/base.html" %}
 {% load staticfiles %}
+{% load i18n %}
 
 {% block title %}Alliance Auth{% endblock %}
 
-{% block page_title %}Available{% endblock page_title %}
+{% block page_title %}{% trans "Available" %}{% endblock page_title %}
 {% block extra_css %}{% endblock extra_css %}
 
 {% block content %}
     <div class="col-lg-12">
-        <h1 class="page-header text-center">Available Groups</h1>
+        <h1 class="page-header text-center">{% trans "Available Groups" %}</h1>
         {% if perms.auth.member %}
             <table class="table table-bordered">
                 <tr>
-                    <th class="text-center">GroupID</th>
-                    <th class="text-center">GroupName</th>
-                    <th class="text-center">GroupDesc</th>
-                    <th class="text-center">Action</th>
+                    <th class="text-center">{% trans "GroupID" %}</th>
+                    <th class="text-center">{% trans "GroupName" %}</th>
+                    <th class="text-center">{% trans "GroupDesc" %}</th>
+                    <th class="text-center">{% trans "Action" %}</th>
                 </tr>
 
                 {% for pair in pairs %}
@@ -28,7 +29,7 @@
                                 {% if pair.2 == "" %}
                                     <a href="/group/request_leave/{{ pair.0.id }}">
                                         <button type="button" class="btn btn-danger">
-                                            Leave
+                                            {% trans "Leave" %}
                                         </button>
                                     </a>
                                 {% else %}
@@ -39,7 +40,7 @@
                             {% elif pair.2 == "" %}
                                 <a href="/group/request_add/{{ pair.0.id }}">
                                     <button type="button" class="btn btn-success">
-                                        Request
+                                        {% trans "Request" %}
                                     </button>
                                 </a>
                             {% else %}
@@ -53,9 +54,9 @@
             </table>
         {% else %}
             {% if IS_CORP %}
-                <div class="alert alert-danger" role="alert">You are not in the corporation.</div>
+                <div class="alert alert-danger" role="alert">{% trans "You are not in the corporation." %}</div>
             {% else %}
-                <div class="alert alert-danger" role="alert">You are not in the alliance.</div>
+                <div class="alert alert-danger" role="alert">{% trans "You are not in the alliance." %}</div>
             {% endif %}
         {% endif %}
     </div>