Replace "Uploader" with "Depositor" on landing page

As discussed in the team meeting today

invenio_theme_tuw/theme/templates/semantic-ui/invenio_theme_tuw/details/uploaders.html

@@ -8,7 +8,7 @@
 {%- set rec = record.id|resolve_record -%}
 {%- set uploader = rec|resolve_first_user_owner -%}
 <section id="record-owners" aria-label="{{ _('Export') }}" class="ui segment rdm-sidebar owners">
-  <h1 class="ui small header">{{ _('Uploader')}}</h1>
+  <h1 class="ui small header">{{ _('Depositor')}}</h1>
 
   <section>
     {%- if uploader.user_profile and uploader.user_profile.full_name -%}