feat: Start tracking timezone offset and language prefix

[rafaeelaudibert]

Changes

We've recently launched a new feature on Web Analytics where you can filter views/visitors by timezone/language. Even though that was possible to do already, it is not as fast as it could be. We'll start feeding this information into the database directly from the SDK, this will allow us to, in the future, update our logic to use these properties directly, ditching the slow code.

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 28, 2024 0:13am

[github-actions]

Size Change: +3.13 kB (+0.1%)

Total Size: 3.18 MB

Filename	Size	Change
dist/array.full.es5.js	257 kB	+285 B (+0.11%)
dist/array.full.js	361 kB	+285 B (+0.08%)
dist/array.full.no-external.js	360 kB	+285 B (+0.08%)
dist/array.js	175 kB	+285 B (+0.16%)
dist/array.no-external.js	174 kB	+285 B (+0.16%)
dist/customizations.full.js	12.5 kB	+285 B (+2.34%)
dist/main.js	176 kB	+285 B (+0.16%)
dist/module.full.js	361 kB	+285 B (+0.08%)
dist/module.full.no-external.js	360 kB	+285 B (+0.08%)
dist/module.js	175 kB	+285 B (+0.16%)
dist/module.no-external.js	174 kB	+285 B (+0.16%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	206 kB
dist/dead-clicks-autocapture.js	14.3 kB
dist/exception-autocapture.js	9.37 kB
dist/external-scripts-loader.js	2.29 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	57.6 kB
dist/surveys.js	63.2 kB
dist/tracing-headers.js	1.75 kB
dist/web-vitals.js	10.3 kB

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