added control sidebar #10 (#87)

- added configurable sidebar #10
- added language switch in sidebar preferences tab #10
- added sidebar tab with kimai beta-info message #10
- use trait for repositories
- improved README

templates/sidebar/home.html.twig

@@ -0,0 +1,40 @@
+<h3 class="control-sidebar-heading">{{ 'home.title'|trans({}, 'sidebar') }}</h3>
+<div class="form-group">
+    {{ 'home.betainfo'|trans({}, 'sidebar')|raw|nl2br }}
+    <ul class="control-sidebar-menu">
+        <li>
+            <a href="https://github.com/kevinpapst/kimai2/" target="_blank">{{ 'home.link.issues'|trans({}, 'sidebar') }}</a>
+        </li>
+    </ul>
+</div>
+{#
+<ul class="control-sidebar-menu">
+    <li>
+        <a href="javascript:;">
+            <i class="menu-icon fa fa-birthday-cake bg-red"></i>
+
+            <div class="menu-info">
+                <h4 class="control-sidebar-subheading">{{ 'Kevin\'s Birthday'|trans({}, 'AvanzuAdminTheme') }}</h4>
+
+                <p>{{ 'Will be 23 on April 24th'|trans({}, 'AvanzuAdminTheme') }}</p>
+            </div>
+        </a>
+    </li>
+</ul>
+
+<h3 class="control-sidebar-heading">{{ 'Tasks Progress'|trans({}, 'AvanzuAdminTheme') }}</h3>
+<ul class="control-sidebar-menu">
+    <li>
+        <a href="javascript::;">
+            <h4 class="control-sidebar-subheading">
+                {{ 'Custom Template Design'|trans({}, 'AvanzuAdminTheme') }}
+                <span class="label label-danger pull-right">70%</span>
+            </h4>
+
+            <div class="progress progress-xxs">
+                <div class="progress-bar progress-bar-danger" style="width: 70%"></div>
+            </div>
+        </a>
+    </li>
+</ul>
+#}

templates/sidebar/settings.html.twig

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+<h3 class="control-sidebar-heading">{{ 'preferences.title'|trans({}, 'sidebar') }}</h3>
+<div class="form-group">
+    <label class="control-sidebar-subheading">
+        {{ 'preferences.label.language'|trans({}, 'sidebar') }}
+        <select class="pull-right" onchange="window.location.href = this.options[this.selectedIndex].value;">
+            {% for locale in locales() %}
+                <option value="{{ path(app.request.get('_route', 'homepage'), app.request.get('_route_params', [])|merge({ _locale: locale.code })) }}" {% if app.request.locale == locale.code %}selected="selected"{% endif %}>{{ locale.name|capitalize }}</option>
+            {% endfor %}
+        </select>
+    </label>
+</div>