CSS tweaks to issue overlay

* Remove CSS rule updating the padding of issue-notice
(this is no longer necessary after
I1b880c46fa3debfc5b68d8b416ca642cca98ce7e which defines its own padding
for the element)
* Overlay title is updated to read "Page issues"

Bug: T187916
Change-Id: I7e41d6f03c4cf9fa7563f2f608eec5be89c04a31

i18n/en.json

@@ -36,7 +36,7 @@
 	"mobile-frontend-main-menu-watchlist": "Watchlist",
 	"mobile-frontend-meta-data-issues": "Page issues",
 	"mobile-frontend-meta-data-issues-categories": "About this category",
-	"mobile-frontend-meta-data-issues-header": "Issues",
+	"mobile-frontend-meta-data-issues-header": "Page issues",
 	"mobile-frontend-meta-data-issues-header-talk": "About this page",
 	"mobile-frontend-meta-data-issues-talk": "About this talk page",
 	"mobile-frontend-notifications-filter": "Filter",

resources/skins.minerva.base.styles/ui.less

@@ -423,7 +423,6 @@ input.search {
 .overlay .content-header,
 .overlay .panel,
 .page-list.side-list .list-thumb,
-.overlay .cleanup li .issue-notice,
 .editor-overlay .wikitext-editor,
 .page-list li,
 .topic-title-list li,