Remember last used target language

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Remember the last used target language (in local storage?) and set it as default when returning to Translate. If I am working on a document I have to select the target language every single time. This is annoying.

I originally reported this here: https://github.com/nextcloud/text/issues/4219
@datenangebot suggested it to be tracked in the Translate repo, but I didn't follow up. So I'm doing that now :)
EDIT: moved from Translate repo to Text repo.

Steps to reproduce

1. Open a .md file
2. Type some text
3. Open Translate, select a target language
4. Translate it
5. Return to editing/writing some text
6. Open Translate again

Actual behaviour

The target language is empty, I have to select it again.

Expected behaviour

The target language should be set to the language that I used when I opened the Translate modal for the first time.

Metadata

• Nextcloud 28.0.0.11
• Firefox 120.0.1
• Ubuntu 23.10

Start at the Translate modal and trace how the selected target language is initialized and cleared when the modal is reopened. Verify the behavior using the listed reproduction steps: after selecting a language and translating a document, reopening Translate should show that language as the target.