EMA

* adds Ema model (basically Compensation inherited)
* adds index view for EMAs
* fixes drop-down link bug for menu 'More' in navbar
* refactors some more forms to use process_request()
* adds modified attribute to BaseResource for easy last_modified check
* adds setting of modified attribute in all places where UserAction.EDITED is added to log
* adds EMA_ACCOUNT_IDENTIFIER_LENGTH and EMA_ACCOUNT_IDENTIFIER_TEMPLATE to ema/settings.py
* adds EmaAdmin to ema/admin.py
* fixes wrong title in intervention detail view html for revocations
* adds support for subtitle variable to BaseTable and generic_index.html
* drops next_version attribute from models
* adds/updates translations
* adds default ordering for UserActionLogEntry
   * removes extra ordering in log modal rendering

templates/navbar.html

@@ -34,13 +34,13 @@
                     {% trans 'Eco-account' %}
                 </a>
             </li>
-            <li class=" menu-elem dropdown" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
-                <a class="nav-btn nav-link">
+            <li class=" menu-elem dropdown">
+                <div class="btn nav-btn" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
                     {% fa5_icon 'ellipsis-v' %}
                     {% trans 'More' %}
-                </a>
+                </div>
                 <div class="dropdown-menu">
-                    <a class="dropdown-item" href="{% url 'home' %}">{% fa5_icon 'euro-sign' %}  {% trans 'EMA' %}</a>
+                    <a class="dropdown-item" href="{% url 'ema:index' %}" title="{% trans 'Payment funded compensations' %}">{% fa5_icon 'euro-sign' %}  {% trans 'EMA' %}</a>
                     <a class="dropdown-item" href="{% url 'home' %}">{% fa5_icon 'file-import' %}  {% trans 'Import...' %}</a>
                     <a class="dropdown-item" href="{% url 'home' %}">{% fa5_icon 'file-export' %}  {% trans 'Export...' %}</a>
                     <a class="dropdown-item" href="{% url 'home' %}">{% fa5_icon 'file-alt' %}  {% trans 'Reports' %}</a>