[webui] Create package branch partial

src/api/app/views/shared/_package_branch_form.html.erb

@@ -0,0 +1,17 @@
+<p>
+  <% if show_source_fields %>
+    <label for="linked_project"><strong>Name of original project:</strong></label><br/>
+    <%= text_field_tag 'linked_project', nil, size: 80, id: 'linked_project', required: true %><br/>
+    <label for="linked_package"><strong>Name of package in original project:</strong></label><br/>
+    <%= text_field_tag 'linked_package', nil, size: 80, id: 'linked_package', required: true %><br/>
+  <% else %>
+    <%= hidden_field_tag(:linked_project, @project.name) %>
+    <%= hidden_field_tag(:linked_package, @package.name) %>
+  <% end %>
+
+  <label for="target_package"><strong>New package name:</strong></label><br />
+  <%= text_field_tag 'target_package', @package.try(:name), size: 80, maxlength: 200 %><br />
+  <%= hidden_field_tag 'target_project', target_project.name if target_project %><br/>
+
+  <%= check_box_tag 'current_revision', false %>Stay on current revision
+</p>