feat: clearer import-probe wording, tooltips, translatable titles (v3.6.43)

The probe's checkbox described the mechanism ('Rewrite the CAP's import
versions before the load'); it now reads 'Enable import probe' (purpose
first) with the mechanism in a tooltip, and the field carries two short
hint lines: what the card checks while loading, and the workflow (Set all
0.0 first; if the LOAD passes the list was the cause, then restore one
line at a time to find the package/version the card lacks).

Static tooltips are translatable now via data-l10n-title (handled by
translatePage, checked against LANG_RU by html.test.js together with
data-l10n); the help's RAM-install section documents the two-step
workflow (EN/RU).

sw cache simple-v316; tests: 530 Python / 676 Node.

frontend/tests/html.test.js

@@ -444,6 +444,7 @@ test('every data-l10n attribute resolves in LANG_RU after HTML decoding', () =>
     const decode = s => s.replace(/&([a-z]+|#[0-9]+);/gi,
         (m, e) => entities[e] !== undefined ? entities[e] : m);
     const attrs = [...html.matchAll(/data-l10n="([^"]*)"/g)].map(m => decode(m[1]));
-    const missing = [...new Set(attrs.filter(k => !(k in dict)))];
+    const titles = [...html.matchAll(/data-l10n-title="([^"]*)"/g)].map(m => decode(m[1]));
+    const missing = [...new Set([...attrs, ...titles].filter(k => !(k in dict)))];
     assert.deepStrictEqual(missing, [], 'data-l10n keys with no LANG_RU entry:\n' + missing.join('\n'));
 });