docs(i18n): add eight more languages to the HALMET documentation

[helmihyo]

Adds French, German, Swedish, Spanish, Italian, Dutch, Norwegian Bokmål and Danish, bringing HALMET level with HALPI2. Nine languages, 72 pages.

The glossaries are HALPI2's

Each was copied from the HALPI2 repository and extended, not written fresh, so the two products do not describe the same part with two different words in the same language. Each adds 67–81 rows of the input-circuit vocabulary HALPI2 never needed — digital and analog inputs, galvanic isolation, constant current source, pull-up and pull-down resistors, solder jumpers — and keeps every inherited typography rule.

Where a HALPI2 decision is deliberately not carried over, the row says so and says why. Finnish power supply → teholähde rather than HALPI2's virtalähde is the one case: on this board virtalähde is a substring of vakiovirtalähde, the constant current source described in the same list, so the reader would meet what looks like one component with a modifier.

Verification

Structure vs. the English source	0 deviations across 72 pages
mkdocs build --strict	clean
check_anchors.py	1220 anchors across 82 pages, all resolve
check_typography.py	clean in all nine
check_glossary.py	clean in all nine
translation_status.py	current=8 in all nine
Safety figures cross-checked	12 values × 10 languages, all agree
Passages read against English	1654, across all nine languages

The English source was wrong in five places

Translating means reading every sentence, which surfaced defects that predate this branch. Three hardware figures each appeared as two different numbers on two different pages; Matti settled all three in #20 and they are corrected here in English and in every translation:

• digital input tolerance is ±32 V, not ±30 V
• the analog measurement range tops out at 33 V, not 32 V
• the maximum measurable resistance is 300 Ω, not 320 Ω

Also fixed: a merged sentence in usage/index.md ("Engine panel gauges are often constructed are usually either…"), which all nine translators independently resolved to the same evident meaning, and two typos in hardware/index.md. The two TODO notes stay, on Matti's instruction — they mark missing content and are to be written separately.

What the review found

Nine languages were reviewed in three phases: each glossary's own rules measured against its pages, a hunt for terms that gained a rival, and a sentence-by-sentence read of the two instruction-dense pages, with every finding then given to a skeptic instructed to refute it.

One defect could have misconfigured a board, and it was in Finnish — the translation I wrote myself and nobody else had read. normally open and normally closed were prescribed the wrong way round in a glossary row of mine, so the pull-down and pull-up descriptions each named the opposite kind of switch. The Finnish contradicted itself inside one sentence — an avautuva switch that pulls the input high sulkeutuessaan — and eight sibling languages had it right, Swedish slutande/brytande and German Schließer/Öffner lining up the same way.

Five page titles disagreed with their sidebar label. All five were introduced by aligning the navigation to HALPI2 after the glossaries were written but before the pages were translated. The pages now follow the navigation and the glossaries record the reasoning, so it is not re-litigated.

Six languages left (constant current source) in English inside their own prose; each glossary already prescribed a term.

Nine further reports were checked and refuted, most because they compared against the wrong English phrase: CCS jumper headers and shorting the jumper contacts are different phrases, so Danish using two words is right; ESP32 Introduction is not the ## Introduction heading found elsewhere.

A checker fix that matters beyond this branch

check_glossary.py was reporting a false green. It matched a prescribed term inside any longer word containing it, so Finnish virtalähde counted as used because vakiovirtalähde appears — two unrelated components. It reported every prescribed term in use while one was never used at all.

A false alarm wastes a reviewer's time; a false green means the check was never doing its job. Both repositories have leaned on this script. The fix is verified against all nine HALMET languages and all nine HALPI2 languages, whose verdicts are unchanged. The same fix is owed to hatlabs/halpi2, whose copy still has it.

What this needs from a reader

Nobody who reads these eight languages has read them. The Finnish was read by its author only, which is how its reversed switch terms survived until an independent review looked. Every mechanical check above passes, and none of them can tell whether a sentence about pull-up resistors says the right thing about pull-up resistors.

Corrections belong in solutions/translation/<language>-glossary.md as well as in the pages, so the next translator inherits them.

🤖 Generated with Claude Code

[github-actions]

Translation status

da — 8 current
de — 8 current
es — 8 current
fi — 8 current
fr — 8 current
it — 8 current
nb — 8 current
nl — 8 current
sv — 8 current

Every translation of the pages in scope is current.