Polyglot

What it does

Polyglot takes the English strings your app and site already have and writes them in up to 42 more languages, in the files and folders each platform expects, using a model you run yourself. Every string comes back checked: if a placeholder, a tag or a name you keep is lost, or the answer is not in the language's script, the string is asked for again, and a string that still fails is left out and reported instead of shipping broken.

• The formats you use. JSON message files (i18next, vue-i18n, next-intl, react-intl), Flutter ARB, Android strings.xml, Apple .strings, gettext .po and Markdown documents, written to values-de, de.lproj, app_de.arb or locale/de.
• Checked string by string. %1$s, {name}, {{count}}, HTML tags, line breaks, URLs and your kept names must come back exactly; the right script, no empty or runaway answers, nothing left in English.
• Real plural forms. Russian gets one, few, many and other, Arabic six forms, Japanese a single form: Android plurals and ICU messages follow each language's own rules.
• Only what changed. Every good translation is remembered, so editing one English string sends one string, not the whole file.
• Your tone and your terms. A product description, a tone, names never to translate and a glossary go into every request, and your comments travel along as notes.
• Your model, your machine. Any OpenAI-compatible server: vLLM, llama.cpp, Ollama or LM Studio, or a hosted API if you choose. No per-word bill.

Tested on a real model

• A real model, six formats, five scripts: a 70-string example app in JSON, Flutter ARB, Android, Apple .strings, gettext and Markdown, into German, Russian, Japanese, Arabic and Spanish, with a 27-billion-parameter open model on our own machine: 346 of 350 strings passed their checks on the way in, in 7.5 minutes on a busy shared server.
• The four that did not were mistakes in our checks, not the model's: a German loanword, an e-mail address and a Japanese plural message. We fixed the checks; the next run sent only those four strings and wrote all 350 in 45 seconds.
• Plural forms right first time: one, few, many and other for Russian, six forms for Arabic, a single one for Japanese.
• All 42 languages: the example's 22 web strings into every language Polyglot knows, from Amharic to Traditional Chinese: 924 of 924 strings written, in 15 minutes.
• And what checks cannot see: in Khmer, "You are offline" came back as "you are online". It is flawless Khmer, so it passed. That is why the documentation asks for a native speaker on the strings that matter most.

What is inside