Feature: Adding Urdu language

[UzaeirAzhar]

Closes #233

Added language keys for Urdu and SVG file for Pakistani flag.

Screenshots

Checklist

• [x] I worked on a branch other than main.
• [x] My branch is up-to-date with the Upstream main branch.
• [x] I have fixed potential errors using yarn lint.
• [x] I ran yarn build to check everything still builds successfully.

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