diff --git a/administrator/language/en-GB/plg_system_debug.ini b/administrator/language/en-GB/plg_system_debug.ini
index cdb82aafd0481..4760a33d8f2a6 100644
--- a/administrator/language/en-GB/plg_system_debug.ini
+++ b/administrator/language/en-GB/plg_system_debug.ini
@@ -30,51 +30,3 @@ PLG_DEBUG_LANGUAGE_FIELDSET_LABEL="Language"
 PLG_DEBUG_LOGGING_FIELDSET_LABEL="Logging"
 PLG_DEBUG_XML_DESCRIPTION="This plugin provides a variety of system information as well as help for the creation of translation files."
 PLG_SYSTEM_DEBUG="System - Debug"
-
-; All the following strings are deprecated and will be removed with 5.0
-PLG_DEBUG_BYTES="Bytes"
-PLG_DEBUG_CALL_STACK="Call Stack"
-PLG_DEBUG_CALL_STACK_CALLER="Caller"
-PLG_DEBUG_CALL_STACK_FILE_AND_LINE="File and line number"
-PLG_DEBUG_CALL_STACK_SAME_FILE="<em>Same as call in the line below.</em>"
-PLG_DEBUG_ERRORS="Errors"
-PLG_DEBUG_EXPLAIN="Explain"
-PLG_DEBUG_LANGUAGE_FILES_IN_ERROR="Parsing errors in language files"
-PLG_DEBUG_LANGUAGE_FILES_LOADED="Language Files Loaded"
-PLG_DEBUG_LANG_LOADED="Loaded"
-PLG_DEBUG_LANG_NOT_LOADED="Not loaded"
-PLG_DEBUG_LINK_FORMAT="Add xdebug.file_link_format directive to your php.ini file to have links for files."
-PLG_DEBUG_LOGS="Log Messages"
-PLG_DEBUG_LOGS_DEPRECATED_FOUND_TEXT="The code that is marked as deprecated will not work in upcoming Joomla versions, please review it."
-PLG_DEBUG_LOGS_DEPRECATED_FOUND_TITLE="%s deprecated messages logged!"
-PLG_DEBUG_LOGS_LOGGED="%s messages logged"
-PLG_DEBUG_MEMORY="Memory"
-PLG_DEBUG_MEMORY_USAGE="Memory Usage"
-PLG_DEBUG_MEMORY_USED_FOR_QUERY="Query memory: %s Memory before query: %s"
-PLG_DEBUG_NO_PROFILE="No SHOW PROFILE (maybe because there are more than 100 queries)"
-PLG_DEBUG_OTHER_QUERIES="OTHER Tables:"
-PLG_DEBUG_PROFILE="Profile"
-PLG_DEBUG_PROFILE_INFORMATION="Profile Information"
-PLG_DEBUG_QUERIES="Database Queries"
-PLG_DEBUG_QUERIES_LOGGED="%d Queries Logged"
-PLG_DEBUG_QUERIES_TIME="Database queries total: %s"
-PLG_DEBUG_QUERY_AFTER_LAST="After last query: %s"
-PLG_DEBUG_QUERY_DUPLICATES="Duplicate queries"
-PLG_DEBUG_QUERY_DUPLICATES_FOUND="Duplicate found!"
-PLG_DEBUG_QUERY_DUPLICATES_NUMBER="%s duplicates"
-PLG_DEBUG_QUERY_DUPLICATES_TOTAL_NUMBER="%s duplicate found!"
-PLG_DEBUG_QUERY_EXPLAIN_NOT_POSSIBLE="EXPLAIN not possible on query: %s"
-PLG_DEBUG_QUERY_TIME="Query Time: %s"
-PLG_DEBUG_QUERY_TYPES_LOGGED="%d Query Types Logged, Sorted by Occurrences."
-PLG_DEBUG_QUERY_TYPE_AND_OCCURRENCES="%2$d &#215; %1$s"
-PLG_DEBUG_ROWS_RETURNED_BY_QUERY="Rows returned: %s"
-PLG_DEBUG_SELECT_QUERIES="SELECT Tables:"
-PLG_DEBUG_SESSION="Session"
-PLG_DEBUG_TIME="Time"
-PLG_DEBUG_TITLE="Joomla! Debug Console"
-PLG_DEBUG_UNKNOWN_FILE="Unknown file"
-PLG_DEBUG_UNTRANSLATED_STRINGS="Untranslated Strings"
-PLG_DEBUG_WARNING_NO_INDEX="NO INDEX KEY COULD BE USED"
-PLG_DEBUG_WARNING_NO_INDEX_DESC="This table probably has a missing index on WHERE equalities and/or JOIN ON column(s) or is written in a way that no index can be used, causing a time-consuming full table scan."
-PLG_DEBUG_WARNING_USING_FILESORT="Using filesort"
-PLG_DEBUG_WARNING_USING_FILESORT_DESC="This table probably has a missing index on WHERE/ON equality column(s) ending by the ORDER BY column(s) or is written in a way that no index can be used, causing a time-consuming filesort."