Added titles for the chemistry aspect panels

[egonw]

Adds missing query titles, needed for downstream use.

Description

Not all chemical aspect queries have titles:

This patch adds a good number of them.

Caveats

The titles are listed as comments in the SPARQL. If not well-formed, it can break running the SPARQL query.

Testing

Check if the following aspects still show content in all panels:

• chemical
• chemical-class
• chemical-element

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)

[fnielsen]

Isn't is a problem that WDQS intepretes #title as something? When we rely on the whitespace could that not go run?

[Daniel-Mietchen]

@egonw Can you adjust your workflows (and thus the PR) such that there is no space between the # and the title:?
Without this space, the titles would be compatible with the way (Wikimedia's version of) Blazegraph handles titles.

[egonw]

@Daniel-Mietchen, @fnielsen, I left the space deliberately, per #2304 (comment)