Resolve "Translate the app in multiple languages"

What does this MR do and why?

• Add translation support
• Add en and fr translation

How to set up and validate locally

make run dev

Use PM_LANG environment variable to change lang

MR acceptance checklist

• My code follows the style guidelines of this project
• I ran pylint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Closes #45 (closed)