[bhuvan-somisetty]

What does this PR do?

Fills in all missing translations for ru, de, it, pt_BR, zh_Hans and zh_Hant with machine translations, same approach as the fr one in #1565 (AI translation beats falling back to English; anyone who finds a better wording can improve it with a PR). Every locale except fr now has all 874 en keys.

Locale	Keys before	Added	Notes
ru	498	394 + 42 few/many plural forms	e.g. 1 транзакция / 3 транзакции / 5 транзакций
de	445	429	informal "du", like the existing strings
it	405	477 + many forms
pt_BR	405	477 + many forms
zh_Hans	426	448
zh_Hant	426	448	converted from the new zh_Hans strings with OpenCC (cn -> t), the same character set the existing zh_Hant strings use

• Existing translations are not touched, only missing keys are added
• Terminology follows the existing strings of each locale (e.g. Банка / Glas / Vaso / Frasco / 罐子 for jar, Fidelity Bond as Fidelity Bond / título de fidelidade / 保证金)
• Each file now follows the key order of en, which makes future diffs easier to compare
• One commit per language, so they can be reviewed separately

Builds on #1541: that PR adds the locale checks (variables, <Trans> components, plural forms) these translations were validated against. Only the i18n(<lang>): ... commits are new here; I'll rebase once #1541 is merged.

Testing

• npx vitest run --project unit src/i18n passes: every {{ variable }}, <n> component and $t() reference matches en, and all plural forms each language needs are present
• Checked with a script that none of the existing strings changed
• Rendered with i18next, e.g. earn.report.chart_tooltip_transactions for 1 / 3 / 5 / 21: 1 транзакция / 3 транзакции / 5 транзакций / 21 транзакция, 1 Transaktion / 3 Transaktionen ..., 1 笔交易 ..., and the nested $t(...) precondition hints
• prettier --check is clean

Visual Demo (For contributors especially)

Image Demo (if applicable):

Storybook per locale (before = #1541, after = this PR):

Before	After

[bhuvan-somisetty]

added de, it, pt_BR, zh_Hans and zh_Hant to this PR as well (one commit per language), so every locale except fr (#1565) now has all keys. screenshots for each are in the description