Fix New UX related bugs for Alerts, BucketList and Abort Upload modal (#5694)

- Center text on Alert component appearing on top
- Change "Upload" to "Continue" on New UX Abort Upload modal
- Fix issue where long bucket names were overflowing instead of
continuing on the next line
- Fix word wrap issue similar to the last one for the alerts that appear
on top
- Help fix the cluttering issue on #5690 as the right margin has been
increased in alerts

Fixes #5689, #5691 and #5695

browser/app/less/inc/sidebar.less

@@ -88,10 +88,11 @@
 }
 
 .buckets__item {
-    padding: 0.8rem @sidebar-padding 0.8rem @sidebar-padding*2.2;
+    padding: 0.8rem @sidebar-padding*1.2 0.8rem @sidebar-padding*2.2;
     background: url(../../img/icons/bucket.svg) no-repeat left 2.2rem center;
     position: relative;
     cursor: pointer;
+    word-wrap: break-word;
 
     & > a {
         &, &:focus, &:hover {