Use the visual markdown editor when editing the invoice terms and notes

[n1smithy]

What version of Invoice Ninja are you running? ie v4.5 / v5
5

What environment are you running?
Docker

Have you searched existing issues/requests?
Yes

Additional context
It's a hard work to create an offer or an invoice if you have to set html-tags manually. There should be one uniformed editoring-standard for every multilined text-area like product-descriptions, notices etc.
For example if I create an offer I'll have to use html-tags to set new lines or paragraphs in the article-description. There are no buttons for font-size, -format or anything. So if I hit Enter/Return there won't be any paragraph or new line in the PDF. But on the other hand if I define a public notice for that offer, a new line will be automatically set in the PDF if I just hit Enter/Return in the text-field. So when I set an
at the end of the previous line there are two new lines there.
So there are two improvements:

1. The behaviour of all text-fields should be the same (please set standards!).
2. The text-interface should be user-friendly because of an intuitive to use front-end.

[hillelcoren]

Hi,

The reason you need to use two line breaks is most likely because the markdown feature is enabled, it can be disabled on Settings > Account Management.

If you highlight text you should see an option to change it's font style.

[n1smithy]

Hi, Hillel,
thank you for your advice. Well, the German translation could be better. But anyway, with option on or off there is no option to change the font style when I highlight any text. And option on seems to (at least) does not work within the public notices field.

[hillelcoren]

Sorry, I was mistaken. The Flutter app provides a visual markdown editor when editing the email templates but this isn't currently used on the edit invoice page.

The React app does show a markdown editor for the terms/notes section, we can look into including this in the Flutter app as well.

[n1smithy]

This would be awesome!