Remove duplicate nested image partial

It had almost exactly the same code as the standard nested image
partial, and its variations were insignificant.

app/views/admin/milestones/_form.html.erb

@@ -27,7 +27,7 @@
     <div class="column">
       <%= f.date_field :publication_date %>
 
-      <%= render "images/admin_image", imageable: @milestone, f: f %>
+      <%= render "images/nested_image", imageable: @milestone, f: f %>
 
       <div class="documents">
         <%= render "documents/nested_documents", documentable: @milestone, f: f %>

app/views/admin/poll/polls/_form.html.erb

@@ -32,8 +32,8 @@
   </div>
 
   <div class="row">
-    <div class="small-12 column">
+    <div class="images small-12 column">
-      <%= render "images/admin_image", imageable: @poll, f: f %>
+      <%= render "images/nested_image", imageable: @poll, f: f %>
     </div>
 
     <div class="clear">

app/views/images/_admin_image.html.erb

@@ -1,40 +0,0 @@
-<div class="images">
-    <div>
-      <%= f.label :image, t("images.form.admin_title") %>
-
-      <%= link_to_add_association t("images.form.add_new_image"), f, :image,
-                            force_non_association_create: true,
-                            partial: "images/image_fields",
-                            id: "new_image_link",
-                            class: "button hollow",
-                            render_options: {
-                              locals: { imageable: imageable }
-                            },
-                            data: {
-                              association_insertion_node: "#nested-image",
-                              association_insertion_method: "append"
-                            } %>
-
-      <%= render_image(f.object.image, :thumb, false) if f.object.image %>
-
-      <div id="nested-image">
-        <%= f.fields_for :image do |image_builder| %>
-
-          <div id="<%= dom_id(image_builder.object) %>" class="image direct-upload nested-fields">
-            <%= image_builder.hidden_field :id %>
-            <%= image_builder.hidden_field :user_id, value: current_user.id %>
-            <%= image_builder.hidden_field :cached_attachment %>
-
-            <%= image_builder.text_field :title, placeholder: t("images.form.title_placeholder"), label: "#{t("images.form.admin_alt_text")}" %>
-
-            <div class="attachment-actions">
-              <div class="small-12 column action-add attachment-errors image-attachment">
-                <%= render_image_attachment(image_builder, imageable, image_builder.object) %>
-              </div>
-            </div>
-          </div>
-
-        <% end %>
-      </div>
-    </div>
-  </div>

config/locales/en/images.yml

@@ -8,8 +8,6 @@ en:
       note: "You can upload one image of following content types: %{accepted_content_types}, up to %{max_file_size} MB."
       add_new_image: Add image
       title_placeholder: Add a descriptive title for the image
-      admin_title: "Image"
-      admin_alt_text: "Alternative text for the image"
     actions:
       destroy:
         notice: Image was deleted successfully.

config/locales/es/images.yml

@@ -7,8 +7,6 @@ es:
       delete_button: Eliminar imagen
       note: "Puedes subir una imagen en los formatos: %{accepted_content_types}, y de hasta %{max_file_size} MB por archivo."
       add_new_image: Añadir imagen
-      admin_title: "Imagen"
-      admin_alt_text: "Texto alternativo para la imagen"
     actions:
       destroy:
         notice: La imagen se ha eliminado correctamente.