Translator: Improve error messages in the translation process

[skytin1004]

Describe the feature you'd like

Description:
The current error messages shown during the translation process are not very descriptive and can be confusing for users. We would like to improve these messages so that users can better understand what went wrong and how to resolve the issue.

Task:

1. Review the error messages in the following modules(src/co_op_translator/translators):
   • ProjectTranslator
   • MarkdownTranslator
   • ImageTranslator
2. Improve any error messages that are unclear or lacking detail.
3. Ensure that the new messages provide enough context for the user to take corrective action.
   • For example, if a file cannot be processed, the error message should include the file name and reason for the failure.
4. Test the improved error messages by running the translation process on sample files with expected errors.

Example:

• Current message: "Error processing file."
• Improved message: "Error processing file 'example.md': Unsupported file format."

This is a great issue for first-time contributors who want to help make the user experience more friendly and informative.

Instructions:

• Fork the repository and clone it locally.
• Update the error messages in the relevant files.
• Test your changes locally to ensure the new error messages work as expected.
• Submit a pull request referencing this issue.

Problem this feature solves

No response

Alternatives considered

No response

Additional context

No response

Are you willing to submit a pull request to implement this feature?

• I am willing to submit a pull request

Code of Conduct

• I agree to follow this project's Code of Conduct