suggestions: Abort when missing parameters

app: Fail when giving invalid API keys

- Remove unnecessary import
- Reorder imports
- Fix whitespace issues

When an API key is passed, fail in the case of an invalid API key even
if an API key is not required. This allows the user to know that the API
key is invalid. Otherwise, they work under the assumption that the API
key is correct, even though it is not.

added my instance :)

keep selected languages and text in url

set default language instead of raise error

Add --disable-web-ui

add python 3.9

unescape html entity codes (ex: &apos)

Upgrade to pyicu>=2.8

To have HTML tags exclusions with attribute translate="no"

Closes #197

README: remove non-working instances

Remove instances that don't work anymore

bug: optimize download btn for mobile

bug: fix translate text/file buttons