[4.4] Complete joomla#40727

joomla#40727 deprecated various search methods in `libraries/src/Language/Language.php`

This PR completes that PR by deprecating their use in the localise.php file

administrator/language/en-GB/localise.php

@@ -48,6 +48,8 @@ public static function getPluralSuffixes($count)
      * @return  array  An array of ignored search words.
      *
      * @since   1.6
+     *
+     * @deprecated  4.4 will be removed in 6.0 without replacement
      */
     public static function getIgnoredSearchWords()
     {
@@ -60,6 +62,8 @@ public static function getIgnoredSearchWords()
      * @return  integer  The lower length limit of search words.
      *
      * @since   1.6
+     *
+     * @deprecated  4.4 will be removed in 6.0 without replacement
      */
     public static function getLowerLimitSearchWord()
     {
@@ -72,6 +76,8 @@ public static function getLowerLimitSearchWord()
      * @return  integer  The upper length limit of search words.
      *
      * @since   1.6
+     *
+     * @deprecated  4.4 will be removed in 6.0 without replacement
      */
     public static function getUpperLimitSearchWord()
     {
@@ -84,6 +90,8 @@ public static function getUpperLimitSearchWord()
      * @return  integer  The number of chars to display when searching.
      *
      * @since   1.6
+     *
+     * @deprecated  4.4 will be removed in 6.0 without replacement
      */
     public static function getSearchDisplayedCharactersNumber()
     {