fix(org-mode): change deprecated keyword

[dschrempf]

Change label to name.

Also substitute colon, which throws a warning with org-lint.

[hlissner]

It seems that #+name for figures is ignored if org-latex-prefer-user-labels is nil (which it is, by default). Can you confirm that this works for you when it's set to nil?

[dschrempf]

From my test (simple figure with simple reference), I can see:

org-latex-prefer-user-labels t; use #label:   Reference in PDF output works, but reference within Org mode does not work.
org-latex-prefer-user-labels t; use #name:    Reference in PDF output works, reference within Org mode works.
org-latex-prefer-user-labels nil; use #label: Reference in PDF output works, reference within Org mode does not work.
org-latex-prefer-user-labels nil; use #name:  Reference in PDF output works, reference within Org mode works.

So it is definitely best to use #name.

I hope this helps!

[hlissner]

Thanks again!