i18n: translate the Fill dialog, layer style contours and Image Size "(was …)" (#1291)

* fix(i18n): translate the Fill dialog labels, contour names and Image Size "(was …)"

The Fill dialog painted its row labels and the Contents options without
going through the catalog, the layer-style contour presets had no catalog
entries, and Image Size formatted "(was …)" in English. i18n-coverage only
sees tl! literals, so these stayed English in every language while it
reported 100%.

Wrap the Fill labels and the Image Size template in tl!, add the missing
keys to every catalog, and add a live test that checks each complete
catalog covers the Fill options and CONTOURS and that the dialog draws in
the selected language.

* chore(contributors): add my real name to the About credits

* i18n: Polish rows for the Fill dialog, contour presets and Image Size

pl.tsv landed on main after this PR; the translation-coverage tests need
every catalog to carry the new strings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

contributors/people.toml

@@ -30,3 +30,6 @@ sync_github_name = false
 [people.reynold-hu]
 real_name = "Reynold Hu"
 sync_github_name = true
+
+[people.ArthurViniciusBA1]
+real_name = "Arthur Vinicius"