Use American spelling throughout - #7180

LMFDB uses American spelling, but British forms had accumulated in comments, docstrings, page text, and a few identifiers. This sweeps them up.

Two commits, so the second can be dropped on its own if you would rather not touch identifiers:

1. Prose (58 lines, 38 files) — comments, docstrings, and user-facing text: behaviour, centre/centred, colour, favourite, fibre, judgement, labelled/labelling, amongst, whilst, acknowledgements, and the -ise family (initialise, normalise, renormalise, factorise, recognise, prioritise, optimise, standardise, desynchronise).

Two of these were also wrong on the facts:

• The CONTRIBUTORS.yaml header points readers at /acknowledgement, but the route is /acknowledgment (lmfdb/app.py:443).
• Abstract groups was the only section of roughly twenty-five offering "Source and acknowledgements". Every other one already said "acknowledgments".

One rewrite rather than a straight swap: tensor_products_navigate.html said "may take a while to load whilst the zeros are computed", where "while ... while" would have read badly, so it is now "as the zeros are computed".

2. Identifiers (27 lines, 8 files) — every name here has all of its references inside one file, or for favourite_list one view and its template, so each rename moves the definition and its uses together:

query_cancelled_error is worth a look: it handles psycopg's QueryCanceledError, which spells it with one l, so the handler and the exception it catches now agree.

Deliberately left alone

• signtocolour, which lmfdb/utils/__init__.py exports in __all__ and five modules import. Renaming it is an API change rather than a spelling fix, so it and the locals built on it (signcolour, thiscolour, colourplus, colourminus, test_signtocolour) are left for a separate decision.
• grey, a valid matplotlib color name and already the spelling the plotting code uses (abvar/fq/isog_class.py, hypergm/web_family.py, local_fields/main.py, and a grey attribute in utils/color.py).
• Proper names: the "Catalogue of Lattices" (also a knowl id, lattice.catalogue_of_lattices), and the International Centre ... / Centre De Recherches Mathematiques institution names in workshops.html.
• Not ours: maths.* URLs and e-mail addresses, the sympow readme quoted in symL/sympowlmfdb.py, and the vendored snap.svg-min.js / jquery.markitup.js.
• Correct in American English anyway: cancellation, characteristic, totally, analogue, and labellist (which is a label list, not a labelling).

How the list was built

Three independent passes over every tracked text file, so a gap in one is caught by another: an explicit British-to-American word list; a suffix sweep (-ise, -our, -tre, -lled, -ogue, -yse) over every distinct word, which is what caught test_favourites, a plural the word list missed; and a substring sweep for British stems buried inside identifiers, which caught favourite_list and query_cancelled_error. Each hit was checked by hand before being changed.

Checks

pyflakes clean on all 34 changed Python files, all 8 changed templates parse, CONTRIBUTORS.yaml still loads (123 documents), and no reference to any renamed identifier remains.

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