[4.4] Deprecate language strings

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#41379 Here are the upstream changes:

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diff --git a/administrator/language/en-GB/plg_user_joomla.ini b/administrator/language/en-GB/plg_user_joomla.ini
index 862eb8cd49a0..dec272734da9 100644
--- a/administrator/language/en-GB/plg_user_joomla.ini
+++ b/administrator/language/en-GB/plg_user_joomla.ini
@@ -7,12 +7,13 @@ PLG_USER_JOOMLA="User - Joomla!"
 PLG_USER_JOOMLA_FIELD_AUTOREGISTER_LABEL="Auto-create Users"
 PLG_USER_JOOMLA_FIELD_FORCELOGOUT_LABEL="Force Logout for all Sessions?"
 PLG_USER_JOOMLA_FIELD_MAILTOUSER_LABEL="Notification Mail to User"
-PLG_USER_JOOMLA_FIELD_STRONG_PASSWORDS_LABEL="Strong Passwords"
 PLG_USER_JOOMLA_MAIL_MAIL_DESC="Sent to a new user when created in the backend."
 PLG_USER_JOOMLA_MAIL_MAIL_TITLE="Users: New User"
 PLG_USER_JOOMLA_NEW_USER_EMAIL_BODY="Hello {NAME},\n\n\nYou have been added as a User to {SITENAME} by an Administrator.\n\nThis email has your username and password to log in to {URL}\n\nUsername: {USERNAME}\nPassword: {PASSWORD}\n\n\nPlease do not respond to this message as it is automatically generated and is for information purposes only."
 PLG_USER_JOOMLA_NEW_USER_EMAIL_SUBJECT="New User Details"
+PLG_USER_JOOMLA_XML_DESCRIPTION="<p>Handles Joomla's default User synchronisation.</p><p><strong>Warning! You must have enabled at least one plugin that handles the user session management or you will lose all access to your site.</strong></p>"
+; Deprecated, will be removed with 5.0
+PLG_USER_JOOMLA_FIELD_STRONG_PASSWORDS_LABEL="Strong Passwords"
 PLG_USER_JOOMLA_POSTINSTALL_STRONGPW_BTN="Enable Strong Password Encryption"
 PLG_USER_JOOMLA_POSTINSTALL_STRONGPW_TEXT="<p>As a security feature, Joomla allows you to switch to strong password encryption.</p><p>To turn strong passwords on select the button below. Alternatively you can edit the User - Joomla plugin and change the strong password setting to On.</p><p>Before enabling you should verify that all third party registration/login, user management or bridge extensions installed on your site support this strong password encryption.</p>"
 PLG_USER_JOOMLA_POSTINSTALL_STRONGPW_TITLE="Strong passwords"
-PLG_USER_JOOMLA_XML_DESCRIPTION="<p>Handles Joomla's default User synchronisation.</p><p><strong>Warning! You must have enabled at least one plugin that handles the user session management or you will lose all access to your site.</strong></p>"