pgAdmin 4 commit: 1) Allow screen-reader to read relationship attribute

1) Allow screen-reader to read relationship attributes for tab, tabpanels and tables under it. Similar changes are done for subnode controls.
2) Add role="img" for font icons.

Fixes #4764

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=f1a18749f65599186a36395d37408a6aed29dcd2
Author: Aditya Toshniwal <aditya(dot)toshniwal(at)enterprisedb(dot)com>

Modified Files
--------------
docs/en_US/release_notes_4_17.rst | 1 +
.../server_groups/servers/static/js/privilege.js | 2 +-
.../server_groups/servers/static/js/server.js | 2 +-
web/pgadmin/browser/static/js/collection.js | 2 +-
web/pgadmin/browser/static/js/node.js | 2 +-
web/pgadmin/browser/static/js/node.ui.js | 4 +-
web/pgadmin/browser/static/js/wizard.js | 10 ++--
.../templates/dashboard/database_dashboard.html | 16 +++----
.../templates/dashboard/server_dashboard.html | 20 ++++----
web/pgadmin/misc/bgprocess/static/js/bgprocess.js | 18 ++++----
web/pgadmin/misc/file_manager/static/js/utility.js | 8 ++--
web/pgadmin/static/js/backform.pgadmin.js | 12 +++--
.../js/sqleditor/history/query_history_entries.js | 4 +-
web/pgadmin/static/vendor/backgrid/backgrid.js | 10 ++++
.../tools/datagrid/templates/datagrid/index.html | 54 +++++++++++-----------
web/pgadmin/tools/sqleditor/static/js/sqleditor.js | 2 +-
16 files changed, 92 insertions(+), 75 deletions(-)