[5.1] remove deprecated language strings from up-merge #42950

[heelc29]

Summary of Changes

remove deprecated language strings - added again due merge conflict in #42950 @LadySolveig @bembelimen
https://github.com/joomla/joomla-cms/pull/42950/files#diff-c958054a01e06914ff9d8d8f3f34f6eafac053a8927e6e3bfb51ceaaa7c39a3e

Now the two strings exist twice

joomla-cms/administrator/language/en-GB/plg_system_privacyconsent.ini

Lines 8 to 9 in d834f81

	PLG_SYSTEM_PRIVACYCONSENT_CACHETIMEOUT_DESC="How often the check is performed."
	PLG_SYSTEM_PRIVACYCONSENT_CACHETIMEOUT_LABEL="Periodic check (days)"

joomla-cms/administrator/language/en-GB/plg_system_privacyconsent.ini

Lines 32 to 33 in d834f81

	PLG_SYSTEM_PRIVACYCONSENT_CACHETIMEOUT_DESC="How often the check is performed."
	PLG_SYSTEM_PRIVACYCONSENT_CACHETIMEOUT_LABEL="Periodic check (days)"

Testing Instructions

code review

[ceford]

I have tested this item ✅ successfully on 0a7a5f3

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42953.}

[Quy]

I have tested this item ✅ successfully on 0a7a5f3

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42953.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42953.}

[tecpromotion]

Thanks @heelc29

[LadySolveig]

Thank you @heelc29