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/notification_view.html

@@ -1,13 +1,14 @@
 {% extends "public/base.html" %}
 {% load staticfiles %}
+{% load i18n %}
 
 {% block title %}View Notification{% endblock title %}
-{% block page_title %}View Notification{% endblock page_title %}
+{% block page_title %}{% trans "View Notification" %}{% endblock page_title %}
 
 {% block content %}
 
     <div class="col-lg-12">
-        <h1 class="page-header text-center">View Notification</h1>
+        <h1 class="page-header text-center">{% trans "View Notification" %}</h1>
         <div class="col-lg-12 container" id="example">
             <div class="row">
                 <div class="col-lg-12">