Create Dataset UI Issues Keywords and URL space (DDS-1056)

Observed on Toyger 1.9.0-d05408a
When creating a new dataset.
1. If an error is encountered on 'Save' press, like missing required field values, the keyword field get cleared out and the user needs to re-enter the keywords.
2. URL field contains space between ".../dataset/" and the generated slug when it should not.
3. Contact field's Organization field label overlaps into the field
4. Keyword field does not support copy and paste of multiple keywords from a text file.
- The users often have a pre-set text file with space-delimited keywords in them that they would like to simply copy and paste into the field.
5. ~~Keyword field does not let user enter multiple keyword without clicking outside the field for each keyword.~~
- The user expects to be able to type-in a keyword (one word or hyphenated phrase), press space, and enter another keyword. The field considers space characters as part of the keyword ~~when it should not~~.
- EDIT: The users will need to explore on their own time how the keyword field works. Would be nice to have a short blurb on how to efficiently enter multiple keywords.

Start in the Dataset creation UI and reproduce each reported behavior: keyword loss after Save validation, the URL spacing, the overlapping Organization label, and multi-keyword paste or entry. Trace the relevant form components and existing UI tests, if present; done means the four remaining behaviors work as described and the edited keyword-entry guidance is clear.

Written by the indexing model from the issue text.