[FE] Finishing touches to Journeys Pages

[Corgam]

• [x] New Journey: Save instead of Continue Journey with the old saving icon
• [x] Browse Journeys: hint after hovering for download and delete buttons
• [x] New Journey: More suiting default values for tags & description
• [x] New Journey: Add labels for all fields
• [x] New Journey: Details popup should include the whole object, not only the content.data.
• [x] Bug: When updating a datapoint (View datasets panel) the return arrow returns to the upload page and not the view datasets page (Simon)
• [x] New Journey: Saving pop-up styling + datafile details pop-up styling
• [x] Document FE: Journey service infrastructure

[salbani]

@Corgam what do you invision under "New Journey: Saving pop-up styling + datafile details pop-up styling"? I added a bit more padding and made the save popup a bit bigger. (_checkout https://github.com/Corgam/SS23_ADSP_TCF/tree/frontend/journey-finishing-touches_)

[salbani]

@Corgam do you want the infrastructure documented in the code via comments or in the wiki?

[Corgam]

@salbani The documentation can be done via code comments, and the rest of it will be written in the report anyways. When it comes to the pop-up styling and the rest of the tasks, I think they look good and can be left as they are :)

[Corgam]

Done via #200