Use !url placeholder in description string on System, Datetime, config_translation and views

Problem/Motivation

This is a followup to #2339021: Incorrect call to l() in system_token_info to improve this string for translation.

'description' => t('A date in a custom format. See <a href="https://www.php.net/manual/datetime.format.php#refsect1-datetime.format-parameters">the PHP documentation</a> for details.'),

Steps to reproduce

Proposed resolution

Use !url placeholder substitution. See #2339021-11: Incorrect call to l() in system_token_info and #2339021-12: Incorrect call to l() in system_token_info for background.

Find all places having the URLs translatable. Replace with the token for the URL.

Remaining tasks

Patch
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User interface changes

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API changes

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Data model changes

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Release notes snippet

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