[6.2] Deprecate unused language strings (#47840)

During the development of #22126 the code was refactored and the new language strings were moved to com_mails but were never removed from com_config

---------

Co-authored-by: BrianTeeman <brian@teeman.net>

Author: richard67

administrator/language/en-GB/com_config.ini

@@ -36,6 +36,7 @@ COM_CONFIG_ERROR_SSL_NOT_AVAILABLE_HTTP_CODE="HTTPS version of the site returned
 COM_CONFIG_ERROR_TMP_PATH_NOTWRITABLE="The temp folder is not writable: %s"
 COM_CONFIG_ERROR_UNKNOWN_BEFORE_SAVING="A plugin reported an unknown error before saving the configuration."
 COM_CONFIG_ERROR_WRITE_FAILED="Could not write to the configuration file"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_FIELD_BODY_LABEL="Body"
 COM_CONFIG_FIELD_CACHE_HANDLER_LABEL="Cache Handler"
 COM_CONFIG_FIELD_CACHE_LABEL="System Cache"
@@ -95,6 +96,7 @@ COM_CONFIG_FIELD_FORCE_SSL_DESC="HTTPS must be enabled on your server or load ba
 COM_CONFIG_FIELD_FORCE_SSL_LABEL="Force HTTPS"
 COM_CONFIG_FIELD_GZIP_COMPRESSION_DESC="Joomla can automatically compress the generated HTML pages with GZip, making them smaller and increasing your site's speed score. Disable it if your server is already doing that for you or if it conflicts with third party extensions."
 COM_CONFIG_FIELD_GZIP_COMPRESSION_LABEL="Gzip Page Compression"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_FIELD_HTMLBODY_LABEL="HTML Body"
 COM_CONFIG_FIELD_LOADBALANCER_ENABLE_DESC="If your site is behind a load balancer or reverse proxy, enable this setting so that IP addresses and other configurations within Joomla automatically take this into account."
 COM_CONFIG_FIELD_LOADBALANCER_ENABLE_LABEL="Behind Load Balancer"
@@ -181,6 +183,7 @@ COM_CONFIG_FIELD_SITE_DISPLAY_MESSAGE_LABEL="Offline Message"
 COM_CONFIG_FIELD_SITE_NAME_LABEL="Site Name"
 COM_CONFIG_FIELD_SITE_OFFLINE_LABEL="Site Offline"
 COM_CONFIG_FIELD_SITENAME_PAGETITLES_LABEL="Site Name in Page Titles"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_FIELD_SUBJECT_LABEL="Subject"
 COM_CONFIG_FIELD_TEMP_PATH_DESC="Joomla needs to temporarily store some files to perform actions such as installing / updating extensions or uploading files. Enter the absolute path of a directory that is writeable by PHP. <em>Do not</em> use the system–wide temporary folder (e.g. <code>/tmp</code>) for security reasons."
 COM_CONFIG_FIELD_TEMP_PATH_LABEL="Path to Temp Folder"
@@ -212,15 +215,20 @@ COM_CONFIG_FIELD_WEBSERVICES_CORS_OFF_LABEL="Enable CORS"
 COM_CONFIG_FIELD_WEBSERVICES_CORS_ALLOW_HEADERS_DESC="Specifies the header(s) sent back in response to a preflight request. Default: Content-Type,X-Joomla-Token"
 COM_CONFIG_FIELD_WEBSERVICES_CORS_ALLOW_METHODS_DESC="Specifies the Web service method(s) allowed to access on this site, sent back in response to a preflight request. Default: all methods available for the requested route."
 COM_CONFIG_FIELD_WEBSERVICES_CORS_ALLOW_ORIGIN_DESC="Specifies the origin allowed to access Web services on this site, sent back in response to a preflight request. Default: * (=all)."
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_FIELDSET_TAGS_LABEL="Tags"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_FILTER_OPTION_SELECT_EXTENSION="- Select Extension -"
 COM_CONFIG_FRONTEDITING_DESC="Joomla can show an overlay in the public front–end, visible only to users with edit privileges, to directly modify the configuration of each module and/or menu displayed on the site. Set to \"None\" to disable this feature."
 COM_CONFIG_FRONTEDITING_LABEL="Frontend Editing"
 COM_CONFIG_FRONTEDITING_MENUSANDMODULES="Modules & Menus"
 COM_CONFIG_FRONTEDITING_MODULES="Modules"
 COM_CONFIG_GLOBAL_CONFIGURATION="Global Configuration"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_HEADING_COMPONENT="Component"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_HEADING_DESCRIPTION="Description"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_HEADING_LANUAGES="Languages"
 COM_CONFIG_LOCATION_SETTINGS="Location"
 COM_CONFIG_LOGGING="Logging"
@@ -230,6 +238,7 @@ COM_CONFIG_MAIL_SETTINGS="Mail"
 COM_CONFIG_MAIL_TEST_MAIL_DESC="Sent when you click the &quot;Send Test Mail&quot; button in the Global Configuration. It is sent to the sending mail address that is set in the mail settings."
 COM_CONFIG_MAIL_TEST_MAIL_TITLE="Global Configuration: Test Mail"
 COM_CONFIG_METADATA_SETTINGS="Metadata"
+; Deprecated as never used. To be removed in Joomla 7.0
 COM_CONFIG_PAGE_EDIT_MAIL="Global Configuration: Edit Mail Template"
 COM_CONFIG_PERMISSION_SETTINGS="Permissions"
 COM_CONFIG_PERMISSIONS="Permissions"