Add missing privacy string 'local_recompletion_ccert_is'

[keevan]

• Add missing string 'privacy:metadata:local_recompletion_ccert_is'
• Reorder lang string section

Before:

There was 1 failure:

1) core_privacy\privacy\provider_test::test_metadata_provider with data set "local_recompletion" ('local_recompletion', 'local_recompletion\privacy\provider')
Expectation failed, debugging() was triggered.
Debugging: Invalid get_string() identifier: 'privacy:metadata:local_recompletion_ccert_is' or component 'local_recompletion'. Perhaps you are missing $string['privacy:metadata:local_recompletion_ccert_is'] = ''; in /var/www/site/local/recompletion/lang/en/local_recompletion.php?

After:

❯ ctrl test --filter 'test_metadata_provider'
Moodle 4.1.5+ (Build: 20230908), e87e6c4cff1dfeb0e2a404db88f88ae567703c61
Php: 8.0.29, pgsql: 14.0 (Debian 14.0-1.pgdg110+1), OS: Linux 5.19.0-50-generic x86_64
PHPUnit 9.5.28 by Sebastian Bergmann and contributors.

...............................................................  63 / 189 ( 33%)
............................................................... 126 / 189 ( 66%)
............................................................... 189 / 189 (100%)


Time: 00:05.900, Memory: 372.00 MB

OK (189 tests, 9515 assertions)