Detect and warning for lowercase Seed input during typing

[Phyloiota]

Description

If you put in a Trinity seed handish you only get a warning that it is shorter than 81 chars until you reach 81 chars, but if you put lowercase characters in the seed during typing it in you dont get that, also you only get a warning if you type an other number then 9 untill you have reached 81 chars. Then the warning appears

Motivation

avoid unnecessary wrong seed inputs

Requirements

create a second (or even third) line for displaying a warning

Open questions (optional)

Use this section to ask any questions that are related to the feature.

Are you planning to do it yourself in a pull request?

No