feat: GutenbergKit internationalization

[dcalhoun]

Description

Ref CMM-280. Provide GutenbergKit with the current locale so that localization may occur.

Testing instructions

See wordpress-mobile/GutenbergKit#120.

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	27661
	Version	PR #24515
	Bundle ID	org.wordpress.alpha
	Commit	7daaa8f
	Installation URL	5ea4brslb98og

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	27661
	Version	PR #24515
	Bundle ID	com.jetpack.alpha
	Commit	7daaa8f
	Installation URL	4jogo8le9o9ag

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud