Documents removing

* adds generic modal rendering using package django-bootstrap-modal-forms
* adds document file removing from hard drive
* adds translations

templates/modal/modal_form.html

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+{% load i18n %}
+{% comment %}
+    A generic modal form template which is based on django-bootstrap-modal-forms package
+    https://pypi.org/project/django-bootstrap-modal-forms/
+{% endcomment %}
+
+
+<form method="post" action="{{form.action_url}}">
+  {% csrf_token %}
+    <div class="modal-header">
+        <h5 class="modal-title">{{form.form_title}}</h5>
+        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+            <span aria-hidden="true">&times;</span>
+        </button>
+    </div>
+
+    <div class="modal-body">
+        <article class="mb-5">{{form.form_caption}}</article>
+        {% for field in form %}
+        <div class="form-group{% if field.errors %} invalid{% endif %}">
+            <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+            {{ field }}
+            {% for error in field.errors %}
+            <p class="help-block">{{ error }}</p>
+            {% endfor %}
+        </div>
+        {% endfor %}
+    </div>
+    <div class="modal-footer">
+        <button type="submit" class="btn btn-default">{% trans 'Continue' %}</button>
+    </div>
+</form>

templates/modal/modal_form_script.html

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+{% comment %}
+    Taken from https://github.com/trco/django-bootstrap-modal-forms
+
+    isDeleteForm refers to reloading the whole page after submitting the form in our case.
+
+{% endcomment %}
+
+    <script type="text/javascript">
+    $(document).ready(function() {
+        $(".{{btn_class}}").each(function () {
+            $(this).modalForm({
+                    formURL: $(this).data("form-url"),
+                    isDeleteForm: {{modal_reload_page}},
+                }
+            );
+        });
+    });
+    </script>