PWA-3283-v2: Adding i18n file path in watch-all.js

[glo11372]

Description

1. To watch the changes run “yarn run watch:all”
2. Also in watch-all.js added file path of venia-ui/i18n so that watch-all.js can detect changes

Related Issue

Closes #3134

Acceptance

Verification Stakeholders

Specification

Verification Steps

Test scenario(s) for direct fix/feature

Test scenario(s) for any existing impacted features/areas

Test scenario(s) for any Magento Backend Supported Configurations

Is Browser/Device testing needed?

Any ad-hoc/edge case scenarios that need to be considered?

Screenshots / Screen Captures (if appropriate)

Breaking Changes (if any)

Checklist

• I have added tests to cover my changes, if necessary.
• I have added translations for new strings, if necessary.
• I have updated the documentation accordingly, if necessary.

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📖	Associated JIRA tickets: PWA-3283.
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