The compare dialog named changed properties, booleans and collection
counts from English literals in the UI namespace, so no locale could
replace them; it also passed bare numbers to tr, so a plural catalogue
entry could never reach its singular form.
Property labels now come from workspace.branches.compare.attr.*, the
true and false values from .value-true and .value-false, and every count
travels through i18n/c, which makes the singular msgstr[0] reachable.
Numbers are rendered with the active locale, so Spanish reads 439,5 and
groups thousands. An attr the catalogue does not name still falls back to
its own key, humanised: a technical identifier rather than prose.
The en.po entries for the counts gain their plural forms. es.po does not
carry the compare area yet, so it stays untouched.
AI-assisted-by: claude-opus-5-5
Signed-off-by: Álvaro Tejero Cantero <alvorithm@teje.ro>