Remove reference to IE9 in the site registration help file

[Kristina Hoeppner]

Mahara master:

In /htdocs/lang/en.utf8/help/pages/site/register.html

Change:
This site requires a current web browser, such as Internet Explorer version 9.0 or higher or any recent version of Firefox, Safari, or Chrome. You must have cookies enabled.

To:
This site requires a current web browser, such as recent version of Firefox, Safari, Chrome, or Internet Explorer Edge. You must have cookies enabled.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/7855

[Cecilia Vela Gurovic (ceciliavg)]

this help file is used in the page htdocs/register.php

To test it:
 - go to an institution setting
 - set Registration allowed to 'yes' and Confirm registration to 'No'
 - save and log out
 - in the login form click the register link under the Login button
 - the Help button next to the title will display the text we are looking for

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/7855
Committed: https://git.mahara.org/mahara/mahara/commit/09a8fee8b745d5e6296a754d032750d18b716f98
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 09a8fee8b745d5e6296a754d032750d18b716f98
Author: Daniel Brady <email address hidden>
Date: Fri Jul 7 14:32:50 2017 +1200

Bug 1702611: Removed an outdated reference to IE9

Change-Id: I1629bb070515bd66cb139fea3c9781eca7f3cb1c
behatnotneeded: Help file content update