[Request] Let's put more features

[tkapias]

Some wishes for the future:

• Add the choice to display the Estimate in different translation than the current interface. Useful to manage many customers languages with the same user.
• Possibility to add a picture from the interface, and upload it to the app. Currently, I host them elsewhere and copy/paste.
• Switch to Markdown. I think everyone will write all their drafts in another text editor, and then paste it to the app. Markdown is the best to stay simple, easy and to keep some formatting from an app to another.
• Add a Table of Content, at least for the view. This will need more header levels.
• Add Page Breaks to the text section editor.