http_server followed by a trailing slash

File usage advice to use --http_server http://localhost/opencart (without trailing slash) and the CLI installer concatenate other directories without adding "/" before the concatenated directory thus saving wrong URLs in config files as eg.: http://localhost/opencartadmin
Update english.php

Added "Submit" text to language file for buttons.
Update contact.tpl

Changed button from "Continue" to "Submit"
Update contact.php

Changed submit button language call.
Update return_form.tpl

Changed return form button from "Continue" to "Submit"
Update return.php

Changed language call for return form submission button from "Continue" to "Submit"
Added default value for config_image_location

There was no default value for config_image_location.
image_location_width and image_location_height are required fields in
store settings (store_form.tpl)
Fixed incorrect default path to logo.png and cart.png
Revert "Added default value for config_image_location"

This reverts commit 6b2bf6d2155ad199600b94c6db7870cc95a26688.
Added default value for config_image_location
duplicated code
Deleted white spaces
do not show errors suppressed with @
Fixed undefined variable:'recurring'
Merge pull request #1629 from leunggamciu/bugfix

Fixed undefined variable:'recurring'
Closes: #1625
Merge branch 'master' of https://github.com/opencart/opencart
more admin template work done
Merge branch 'master' of https://github.com/opencart/opencart
more admin template work done