Bug 33128: Add Polish translations for language descriptions

Bug 33128: Add Polish translations for language descriptions

This adds the Polish translations for the different languages to
subtag_registry.sql that is used by all languages during installation.

* Apply patch
* Run database update
* Install pl-PL and activate it for the OPAC
* Go to advanced search
* Look at the language pull down - it shows the languages in their
  language and then translated to English
* Switch to Polish - verify the Polish translations are used now
  There are 2-3 cases where the translation = name, so only name is shown.
* Drop your database, create your database
* Run the web installer
* Everything should complete without error and the language pull down
  should look exactly the same and be translated

Signed-off-by: Nick <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 0b4e73cd7b5a456f2e994937f96244fc0b19be0c)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>