Localize hardcoded aria-labels (16 sites across 10 components)

[gnarlings]

Summary

16 aria-label values across 10 components are hardcoded English string literals instead of resolving through useLocalizedStrings / contributions/localizedStrings.json. Screen-reader users in any non-English locale get English labels for these controls.

The gap is inconsistent within single files, which is what makes it easy to miss. SegmentListView.tsx:72 correctly localizes the merge button's label, while SegmentListView.tsx:382 hardcodes "Scroll to active verse" a few hundred lines later.

Inventory

Literal labels

File	Line	Current value
src/components/PhraseBox.tsx	53	Phrase gloss
src/components/PhraseBox.tsx	354	Edit phrase
src/components/PhraseBox.tsx	366	Unlink phrase
src/components/SegmentFreeTranslationInput.tsx	52	Free translation
src/components/TokenLinkIcon.tsx	252	Unlink tokens
src/components/TokenLinkIcon.tsx	322	Link tokens
src/components/ArcOverlay.tsx	327	Split phrase here
src/components/SegmentListView.tsx	382	Scroll to active verse
src/components/ContinuousView.tsx	971	Previous token
src/components/ContinuousView.tsx	1056	Next token
src/components/controls/ViewOptionsDropdown.tsx	178	View options
src/components/controls/ViewOptionsDropdown.tsx	205	View options

Interpolated labels

These need the {placeholder} pattern already established by %interlinearizer_morphemeGloss_label% ("Gloss for morpheme {form}").

File	Line	Current value
src/components/TokenChip.tsx	358	`Remove ${token.surfaceText} from phrase`
src/components/TokenChip.tsx	454	`Gloss for ${token.surfaceText}`
src/components/TokenChip.tsx	497	`Show suggestions for ${token.surfaceText}`
src/components/PhraseBox.tsx	554	`Remove ${token.surfaceText} from phrase`

Decisions needed before implementing

1. Reconcile near-duplicates. contributions/localizedStrings.json already defines %interlinearizer_boundaryControl_split% as "Split segment here", but ArcOverlay.tsx:327 hardcodes "Split phrase here". Are these one string or two? (Segment vs. phrase is a real domain distinction here, so this needs a decision rather than a merge.)
2. Deduplicate Remove {token} from phrase, which appears identically in both TokenChip.tsx:358 and PhraseBox.tsx:554 — one key, two call sites.
3. View options appears twice in the same file (ViewOptionsDropdown.tsx:178 and :205) — confirm both are the same control surface and share one key.

Test impact

Several tests query these controls via getByLabelText / aria-label. Localizing the labels means those queries resolve through the useLocalizedStrings stub in __mocks__/papi-frontend-react.ts, which will need to return the resolved English values for the new keys so existing assertions keep passing. Expect churn in the component test files, not just the components.

Notes

Found while investigating unrelated button-sizing regressions from the Tier 1 platform-bible-react migration (#165). No functional/visual bug — purely i18n/a11y coverage.