Show number of entries per file, when collapsed.

services/web/app/views/project/editor/review-panel.pug

@@ -95,6 +95,9 @@
 				ng-click="reviewPanel.overview.docsCollapsedState[doc.doc.id] = ! reviewPanel.overview.docsCollapsedState[doc.doc.id]"
 			)
 				| {{ doc.path }}
+				span.rp-overview-file-num-entries(
+					ng-show="reviewPanel.overview.docsCollapsedState[doc.doc.id]"
+				)  ({{ reviewPanel.entries[doc.doc.id] | numKeys }})
 				span.rp-overview-file-header-collapse(
 					ng-class="{ 'rp-overview-file-header-collapse-on': reviewPanel.overview.docsCollapsedState[doc.doc.id] }"
 				)

services/web/public/stylesheets/app/editor/review-panel.less

@@ -571,6 +571,11 @@
 	text-align: center;
 	cursor: pointer;
 }
+
+	.rp-overview-file-num-entries {
+		font-weight: normal;
+		font-size: 0.9em;
+	}
 	.rp-overview-file-header-collapse {
 		display: inline-block;
 		float: right;