Pagination improvements (#1445)

* Replace will_paginate with kaminari

* Use #page instead of #paginate in controllers

* Replace will_paginate.page_gap with pagination.truncate in i18n

* Customize kaminari views to match prior styles

* Set kaminari options to match prior behavior

* Replace will_paginate with paginate in views

app/views/kaminari/_next_page.html.haml

@@ -0,0 +1,9 @@
+-#  Link to the "Next" page
+-#  available local variables
+-#    url:           url to the next page
+-#    current_page:  a page object for the currently displayed page
+-#    total_pages:   total number of pages
+-#    per_page:      number of items to fetch per page
+-#    remote:        data-remote
+%span.next
+  = link_to_unless current_page.last?, safe_join([t('pagination.next'), fa_icon('chevron-right')], ' '), url, rel: 'next', remote: remote

app/views/kaminari/_paginator.html.haml

@@ -0,0 +1,16 @@
+-#  The container tag
+-#  available local variables
+-#    current_page:  a page object for the currently displayed page
+-#    total_pages:   total number of pages
+-#    per_page:      number of items to fetch per page
+-#    remote:        data-remote
+-#    paginator:     the paginator that renders the pagination tags inside
+= paginator.render do
+  %nav.pagination
+    = prev_page_tag unless current_page.first?
+    - each_page do |page|
+      - if page.display_tag?
+        = page_tag page
+      - elsif !page.was_truncated?
+        = gap_tag
+    = next_page_tag unless current_page.last?

app/views/kaminari/_prev_page.html.haml

@@ -0,0 +1,9 @@
+-#  Link to the "Previous" page
+-#  available local variables
+-#    url:           url to the previous page
+-#    current_page:  a page object for the currently displayed page
+-#    total_pages:   total number of pages
+-#    per_page:      number of items to fetch per page
+-#    remote:        data-remote
+%span.prev
+  = link_to_unless current_page.first?, safe_join([fa_icon('chevron-left'), t('pagination.prev')], ' '), url, rel: 'prev', remote: remote