Corrected 2 typos
BUG FIX on address.php

When you have customs fields associated with shipping address, that are requiered and have been left in blank by the user, a bug exist in which the custom field is not marked in red, and the explain text is not displayed.

This code Fix the bug

pd: I have spent 6 hours to figure it out because i'm new to opencart.

Regards
BUG FIX on address_form.tpl

This BUG apply to the following situation:
Custom field in radio style associate to shipping address and requiered
Then you try to edit the address from your address book
and bug notice appear sayin 'value' is unknow

This fix the bug

I also think that we need to fix the other instances where
$address_custom_field['value'])
must be
$address_custom_field[$custom_field['custom_field_id']])

like in checkbox and select section (Lines 114 and 159), but I have tested this with the radio type only.

So comments are welcome
better specified extensions in Extension Installer
Merge pull request #1974 from CoverUp/patch-2

BUG FIX on address_form.tpl
Merge pull request #1976 from martinille/patch-2

better specified extensions in Extension Installer
Merge pull request #1973 from CoverUp/patch-1

BUG FIX on address.php
Merge pull request #1971 from gortsilas/typo2

Corrected 2 typos