Add placeholder to indicate required file types in forms

app/templates/corpora/add_corpus_file.html.j2

@@ -24,7 +24,7 @@
             {{ M.render_field(add_corpus_file_form.publishing_year, material_icon='access_time') }}
           </div>
           <div class="col s12">
-            {{ M.render_field(add_corpus_file_form.file, accept='.vrt') }}
+            {{ M.render_field(add_corpus_file_form.file, accept='.vrt', placeholder='Choose your .vrt file') }}
           </div>
         </div>
       </div>

app/templates/macros/materialize.html.j2

 {% macro render_field(field) %}
-  {% if field.flags.required %}
+  {% if field.flags.required and field.type not in ['FileField', 'MultipleFileField'] %}
     {% if 'class_' in kwargs and 'validate' not in kwargs['class_'] %}
       {% set tmp = kwargs.update({'class_': kwargs['class_'] + ' validate'}) %}
     {% else %}
@@ -35,7 +35,7 @@
     {% endif %}
     <label>
       {{ field.label.text }}
-      {{ field() }}
+      {{ field(*args, **kwargs) }}
       <span class="lever"></span>
     </label>
     {% for error in field.errors %}
@@ -46,18 +46,19 @@
 
 {% macro render_decimal_range_field(field) %}
   <p class="range-field">
-    {{ field(**kwargs) }}
+    {{ field(*args, **kwargs) }}
   </p>
 {% endmacro %}
 
 {% macro render_file_field(field) %}
+  {% set placeholder = kwargs.pop('placeholder', '') %}
   <div class="file-field input-field">
     <div class="btn">
       <span>{{ field.label.text }}</span>
-      {{ field(**kwargs) }}
+      {{ field(*args, **kwargs) }}
     </div>
     <div class="file-path-wrapper">
-      <input class="file-path validate" type="text">
+      <input class="file-path validate" type="text" placeholder="{{ placeholder }}">
     </div>
   </div>
 {% endmacro %}
@@ -67,7 +68,7 @@
     {% if 'material_icon' in kwargs %}
       <i class="material-icons prefix">{{ kwargs.pop('material_icon') }}</i>
     {% endif %}
-    {{ field(**kwargs) }}
+    {{ field(*args, **kwargs) }}
     {{ field.label }}
     {% for error in field.errors %}
       <span class="helper-text red-text">{{ error }}</span>

app/templates/services/file-setup.html.j2

@@ -36,7 +36,7 @@
             {{ M.render_field(add_job_form.description, data_length='255', material_icon='description') }}
           </div>
           <div class="col s12">
-            {{ M.render_field(add_job_form.files, accept='image/jpeg, image/png, image/tiff') }}
+            {{ M.render_field(add_job_form.files, accept='image/jpeg, image/png, image/tiff', placeholder='Choose your .jpeg, .png or .tiff files') }}
           </div>
           <div class="col s12 hide">
             {{ M.render_field(add_job_form.version, material_icon='apps') }}

app/templates/services/nlp.html.j2

@@ -54,7 +54,7 @@
             {{ M.render_field(add_job_form.description, data_length='255', material_icon='description') }}
           </div>
           <div class="col s12 l5">
-            {{ M.render_field(add_job_form.files, accept='text/plain') }}
+            {{ M.render_field(add_job_form.files, accept='text/plain', placeholder='Choose your .txt files') }}
           </div>
           <div class="col s12 l4">
             {{ M.render_field(add_job_form.language, material_icon='language') }}

app/templates/services/ocr.html.j2

@@ -36,7 +36,7 @@
             {{ M.render_field(add_job_form.description, data_length='255', material_icon='description') }}
           </div>
           <div class="col s12 l5">
-            {{ M.render_field(add_job_form.files, accept='application/pdf') }}
+            {{ M.render_field(add_job_form.files, accept='application/pdf', placeholder='Choose your .pdf files') }}
           </div>
           <div class="col s12 l4">
             {{ M.render_field(add_job_form.language, material_icon='language') }}