fix(cdn): correct WP Rocket brand spelling

[vku2018]

Summary

• Correct WPRocket to WP Rocket in the RocketCDN expired-license UI strings.
• Update the editable .po/.pot catalog entries for the same brand-name typo.
• Leave internal identifiers such as WPRocketUninstall unchanged.

Backward Compatibility

Breaking Change? No

Validation

• git diff --check
• rg -n "WPRocket licence|WPRocket license|Your WPRocket|licence WPRocket|lisans.*WPRocket" inc views languages -g "*.php" -g "*.po" -g "*.pot" returned no matches.

Not run locally

• php -l ..., composer phpcs-changed, composer phpcs, and composer run-stan: PHP and Composer are not installed on this machine.
• .mo regeneration: msgfmt and wp CLI are not installed, so compiled translation binaries were left untouched.

Closes #8588

[codacy-production]

Up to standards ✅

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