Skip empty strings in translation to avoid unnecessary errors

[tomasen]

Related to #59

Implements a check to skip empty strings in the translation process to enhance efficiency and reduce errors.

• Adds a condition at the beginning of the plaintranslate function in src/core/translator.ts to immediately return the input string if it is empty, effectively skipping the translation process for empty strings.
• Utilizes str.trim() === '' to check for empty strings, ensuring that strings containing only whitespace are also skipped.

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[tomasen]

skip empty and blank string

[ParvinEyvazov]

Awesome! Thank you for your contribution @tomasen.