chore: increase image upload limit to 50mb

[bigint]

What does this PR do?

🤖 Generated by Copilot at cc73003

Removed outdated and incomplete translations from messages.po files for various languages. Increased the maximum image size limit for uploading attachments in the web app and updated the corresponding error message in en/messages.po.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at cc73003

• Increase the maximum allowed image size for uploading in the web app from 10MB to 50MB (link)
• Update the English translation for the image size error message to reflect the new limit (link)
• Remove the outdated or missing translations for the image size error message in French, Russian, Tamil, and Chinese (link, link, link, link)
• Remove the unnecessary empty lines after the translations in messages.po files for better code readability and consistency (link, link, link, link)

Emoji

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Name	Status	Preview	Updated (UTC)
prerender	✅ Ready (Inspect)	Visit Preview	May 26, 2023 5:59pm
web	✅ Ready (Inspect)	Visit Preview	May 26, 2023 5:59pm