Issue #2861072 by tar_inet, lomasr, imrancluster, cornelyus, jansete, th_tushar, RenatoG, Gábor Hojtsy, faline, saurabh rawat, cilefen: Change "users" to "user(s)" in user actions for consistency

Issue #2691971 by imrancluster, lluvigne, andrewmacpherson, royal121, John Cook, emallove, tstoeckler, alexpott, Cottser, ok_lyndsey, webchick: "Update Notifications" #title repeated for drupal 8 installation in configure site page

Issue #2710279 by imrancluster: Need full stop (.) for description field's help text for Add Scale effect in Image Styles section

Issue #2678550 by imrancluster: Need full stop (.) for description field's help text in Add comment type' section