2020-07-16 10:20:09 +02:00
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# Backend Translations
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PhotoPrism uses [gettext](https://en.wikipedia.org/wiki/Gettext) for localizing frontend and backend.
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It's one of the most widely adopted standards for translating user interfaces.
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2021-08-13 20:06:55 +02:00
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Human-readable messages like `File not found` are used as ids for finding matching translations,
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2020-07-16 10:20:09 +02:00
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and used as defaults whenever there is no translation available.
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Messages may optionally contain placeholders, like `Found %d files`, for numbers and
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other variables.
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We strongly recommend [Poedit](https://poedit.net/download) for creating and updating translations.
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Download is free for Mac, Windows and Linux.
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It's source code can be obtained on [GitHub](https://github.com/vslavik/poedit).
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Only asynchronous notifications and certain API responses need translation to provide a
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consistent user experience.
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Technical log messages should be in English to avoid ambiguities and (even slightly) wrong translations.
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2021-08-13 20:06:55 +02:00
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`default.po` files in subdirectories contain localized messages for each
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2020-07-16 10:20:09 +02:00
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[language](https://www.gnu.org/software/gettext/manual/html_node/Usual-Language-Codes.html#Usual-Language-Codes),
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2021-10-10 09:44:30 +02:00
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identified by their [locale](https://www.gnu.org/software/gettext/manual/html_node/Usual-Language-Codes.html),
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2020-07-16 10:20:09 +02:00
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like `de/default.po` for German. You can open, edit and save them with Poedit. Please
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also add and commit binary `*.mo` files, which will be automatically created by Poedit.
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To add a new translation, open `messages.pot`, click on "Create New Translation" at the bottom, select
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the language, and start translating.
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When done, create a new directory (using the locale as name) and save your translation there as `default.po`.
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The POT file `/assets/locales/messages.pot` will be automatically updated when
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running `go generate` in `/internal/i18n` or `make generate` in the main project directory.
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Note that this will only work when you have gettext installed on your system.
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We recommend using our latest development image as described in the Developer Guide.
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Apply changes to existing translations by clicking on "Catalogue" > "Update from POT File..."
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in the Poedit app menu.
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