As discussed. achemso.layout contains both "Chart" and "Graph", therefore it
does not make sense to use "Graph" in the "Chart" / "Graph" / "Diagram" sense,
but in the mathematical sense like in "graph theory".
Therefore I added the context [[mathematicl]].
All translations are unchanged except the german one, which is now again
"Graph" as in 2.0.0 instead of "Schaubild".
These translations were only in lib/layouttranslations. I don't know if they
were reviewed, but I understand enough dutch to be sure that they are not
completely wrong, so they are good enough for the GUI.
This is consistent with the treatment in LyX itself (cleanTranslation() is
also called on the translated strings), and some translators leave the context
in the translated msgstr (e.g. [[List of Listings]]), although that is not
recommended. Without this, lib/layouttranslations would contain wrong
translations.
lyx_pot.py treats the combination IsPredefined == true and UsesFloatPkg == true
incorrectly: In this case it does not extract the float name, although it needs
to be extracted. This was no problem for LyX 2.0.0, because no layout contained
this combination fo flags. However, the current version of achemso.layout uses
it for several styles, e.g. "List of Schemes".
You only see the bug if you remove lib/layouttranslations before updating it,
otherwise it would be covered by the old translations which are kept. The fix
make use of the fact that IsPredefined == false and UsesFloatPkg == false is
not supported by LyX to simplify the logic.