Bug fixes (#5218)

* PLT-5319 - Fixing text alignment security modal

* PLT-5280 - Fixing add comment button in RHS mobile

* PLT-5397 - Fixing Floating timestamp on mobile

* PLT-5129 - Hiding formatting help text

* PLT-5242 - Adjusting team sidebar border on IE!!

* PLT-5226 - Placing settings toggle over header

* PLT-5222 - Placed team description tooltip on top

* PLT-5201 - Account settings overlap on mobile

* PLT-5138 - Adding bg to pending post actions

* PLT-5286 - Adjusting play button on youtube videos

* PLT-5313 - Adjusting space between emoji reactions

* PLT-5187 - Adjusting text in channel switcher

* PLT-5399 - Reverting button alignment in modal

webapp/sass/layout/_headers.scss

@@ -275,8 +275,9 @@
         .sidebar-header-dropdown,
         .admin-navbar-dropdown {
             font-size: .85em;
-            position: absolute;
+            left: 0;
             margin-right: -15px;
+            position: absolute;
             right: 22px;
             top: 10px;
             z-index: 5;
@@ -287,16 +288,19 @@
                 @include single-transition(all, .1s, linear);
                 background: none;
                 color: $white;
-                float: right;
+                display: block;
                 font-size: 1em;
+                height: 40px;
+                left: 0;
                 line-height: 1.8;
                 padding: 10px;
+                width: 100%;
             }
 
             .dropdown-menu {
-                width: 199px;
-                margin-top: 4px;
                 margin-right: 3px;
+                margin-top: 4px;
+                width: 199px;
 
                 a {
                     overflow: hidden;
@@ -308,6 +312,7 @@
             .sidebar-header-dropdown__icon,
             .admin-navbar-dropdown__icon {
                 fill: $white;
+                float: right;
             }
         }