The Bug:

Some words within some test command strings are always pluralized.

This is an issue because when the value before the given noun is "1", the noun's plural form is used instead of its singular one, therefore making the string grammatically incorrect in some cases. 

Affected Strings:

Before reading the table, please note the following:

• Words colored in GREEN are correct.
• Words colored in RED are incorrect.

Translation Key	Current String	Expected String	String URL on Crowdin
commands.test.summary.optional_failed	%s optional tests failed	%s optional test(s) failed	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404188
commands.test.summary.failed	%s required tests failed	%s required test(s) failed	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404186
commands.test.summary.all_required_passed	All required tests passed	Required test(s) passed	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404184
commands.test.summary	Game Test complete! %s tests were run	Game Test complete! %s test(s) were run	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404182
commands.test.run.running	Running %s tests...	Running %s test(s)...	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404180
commands.test.clear.success	Cleared %s structures	Cleared %s structure(s)	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5404152

Alternatively, instead of having one string cover both the plural and non-plural variants of the word, two separate translation strings could be created, one of which covers the plural variant and the other that covers the non-plural variant.

Steps to Reproduce:

1. Display any of the affected strings as listed above by using the command provided below and replacing "XYZ" with the string's translation key.

   /tellraw @s {"translate":"XYZ"}

2. Look closely at the affected words within the string.

Observed Behavior:

Some words are always pluralized.

Expected Behavior:

All words would be correctly singularized or pluralized where appropriate.