Aria-Label missing for various buttons

[Simon-Laux]

• jump down button in message list (both modes should have different strings (jump back, jump/scroll down completely), translation strings also need to be create)
• verified chat/contact icon has no aria label
• accounts in account list should have account name & label in aria label -> maybe also connection state and if account is muted
• avatar in profile view should say "avatar of " instead of reading aloud the cryptic filename

[WofWca]

To be precise, not all of this needs to be fixed by adding an aria-label attribute. For example, there is aria-description.

For account list, maybe aria-describedby is more suitable because we have a tooltip / popup there.

Also, while we're at it, some aria-labels are English-only currently. They can be found with aria-label=' and aria-label={'.

About avatars, here are the places where it's missing:

deltachat-desktop/packages/frontend/src/components/Avatar/index.tsx

Line 111 in 48e755d

<button

deltachat-desktop/packages/frontend/src/components/GroupImage.tsx

Line 49 in a5c0243

<Avatar