COD uploader

- [x] Change "Upload from COD" to something like "Get from COD" (otherwise it can give the impression you are referring to uploading structures to the COD)
- [ ] If I saw correctly, then, the number of matches is displayed only once they are also loaded by the widget. If your query returns a large number of structures, this can take a long time (happened to me, e.g. by typing `Ni`). Better show this immediately so that people can change the query
- [x] I would add examples of the Hill notation.
The current text alone is not really self-explanatory - the first sentence suggests you are supposed to put only numbers (e.g. 6 6 for 6 carbons and 6 hydrogens). Either remove it completely or keep information there that might be complementary to the examples you provide