feat(lang): Latin temporal names from the Missal

Every entry is transcribed from the 1962 Missal's own propers headings in
docs/research/LT.txt and cites where it came from; names constructed by
following a neighbouring pattern are marked as such, so a reader can tell
transcription from inference.

The coverage test is the point of this commit. It walks every day of
2020-2045 and fails naming any slug with no Latin name -- the test that
would have caught the original defect, where a printed booklet said
ef-septuagesima-sunday-2 because nothing asserted that names exist.

The three Triduum names reuse the exact strings temporal_ef.ml already
carries, so the engine and the language file cannot disagree.

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