Rails · I18n YAML · 46 languages · Free

Translate config/locales/en.yml, then read every line back before you ship

Upload config/locales/en.yml — KAERIS translates all 46 languages, then reads each line back to you in your own language and flags the ones worth a second look. Catch the shaky ones before release, not after. %{name} interpolation and nested one/other pluralization keys stay in place, the shape the I18n gem expects.

Translate your locale file $ pip install kaeris

✓ %{name} interpolation preserved ✓ one/other/zero pluralization keys kept ✓ Locale-rooted YAML (en: ...) auto-detected ✓ Real YAML out, no reshaping ✓ No account needed

Localize your Rails app in 3 steps

Upload en.yml

Drop config/locales/en.yml in, or run kaeris translate config/locales/en.yml --langs de,fr,ru.

Pick target locales

46 languages — KAERIS detects the single en: root key and re-roots each output under its own locale code.

Ship

Drop de.yml into config/locales/ and add :de to available_locales.

Real Rails-shaped YAML, root key and all

Before → after

            
            config/locales/en.yml
          
en:
  welcome: "Welcome back, %{name}!"
  cart:
    zero: "Your cart is empty"
    one: "%{count} item"
    other: "%{count} items"
  save: "Save changes"

            
            config/locales/de.yml
          
de:
  welcome: "Willkommen zurück, %{name}!"
  cart:
    zero: "Dein Warenkorb ist leer"
    one: "%{count} Artikel"
    other: "%{count} Artikel"
  save: "Änderungen speichern"

Rails detects a single 2-letter root key (en:) and nests everything underneath — KAERIS recognizes that shape automatically and re-roots the translated tree under each target's own code. Since Rails pluralization is just nested zero/one/other keys, KAERIS translates whichever categories you already have; add few/many to your source first if a Slavic target locale's I18n backend expects them.

Built for Rails I18n

%{name} interpolation preserved

Ruby-style %{name} placeholders are never dropped, renamed or mistranslated.

Pluralization keys kept

zero/one/other nested under a key are each translated on their own — no collapsing into a single string.

Locale-rooted YAML aware

Recognizes Rails' en:-rooted convention and rewrites the root key per target locale automatically.

One CLI command

kaeris translate config/locales/en.yml --langs de,fr,ru — wire it into a Rake task or CI job.

Why KAERIS

✓ Placeholder-safe — %{name} is never dropped or mistranslated.

✓ Format-native — real locale-rooted YAML out, not a flattened wrapper you have to reshape.

✓ Verify-meaning QA — every string is back-translated to catch meaning drift before you ship.

✓ No account needed — drag & drop free up to 10,000 characters, or use the CLI/API.

✓ Honest flat pricing — no per-seat, no per-language multiplier. See plans

Beyond YAML, KAERIS speaks all 11 formats — JSON, YAML, .strings, .po, ARB, Android XML, CSV (incl. Godot/Unity), XLIFF, .properties, .resx and Mozilla Fluent (.ftl) — same placeholder-safe engine across your whole stack.

Ship your Rails app in every market

46 languages, %{name}-safe, I18n-native. Free to start, no account required.

$ pip install kaeris
$ kaeris translate config/locales/en.yml --langs de,fr,ru

Translate your locale files now