Various UI fixes (#14239)

* Fix #14238

* Fix #14235

* Fix #14237

* Fix #14234

* Use octicon to show private status of repo in admin dashboard

* Fix #14232

* Fix #14236

web_src/less/_repository.less

@@ -1475,7 +1475,7 @@
     }
   }
 
-  .diff-box .header {
+  .diff-box .header:not(.resolved-placeholder) {
     display: flex;
     align-items: center;
 
@@ -1493,6 +1493,15 @@
     }
   }
 
+  .diff-box .resolved-placeholder {
+    display: flex;
+    align-items: center;
+
+    .button {
+      padding: 8px 12px;
+    }
+  }
+
   .diff-file-box {
     margin-top: 1rem;
     margin-bottom: 1rem;
@@ -2697,7 +2706,12 @@ tbody.commit-list {
 
 .commit-body {
   white-space: pre-wrap;
-  margin: 0;
+}
+
+.repository:not(.diff) {
+  .commit-body {
+    margin: 0;
+  }
 }
 
 .git-notes.top {