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/addsignature.html

@@ -1,16 +1,17 @@
 {% extends "public/base.html" %}
 {% load bootstrap %}
 {% load staticfiles %}
+{% load i18n %}
 
 {% block title %}Alliance Auth - Signature Create{% endblock %}
 
-{% block page_title %}Create Signature{% endblock page_title %}
+{% block page_title %}{% trans "Create Signature" %}{% endblock page_title %}
 {% block extra_css %}
     <link href="{% static 'css/jquery.datetimepicker.css' %}" rel="stylesheet" type="text/css">{% endblock extra_css %}
 
 {% block content %}
     <div class="col-lg-12">
-        <h1 class="page-header text-center">Create Signature</h1>
+        <h1 class="page-header text-center">{% trans "Create Signature" %}</h1>
 
         <div class="container-fluid">
             <div class="col-md-4 col-md-offset-4">
@@ -19,7 +20,7 @@
                             {% csrf_token %}
                             {{ form|bootstrap }}
                             <br/>
-                            <button class="btn btn-lg btn-primary btn-block" type="submit">Create Signature</button>
+                            <button class="btn btn-lg btn-primary btn-block" type="submit">{% trans "Create Signature" %}</button>
                         </form>
                 </div>
             </div>