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Translations
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============
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The Qt GUI can be easily translated into other languages. Here's how we
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handle those translations.
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Files and Folders
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-----------------
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### bitcoin-qt.pro
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This file takes care of generating `.qm` files from `.ts` files. It is mostly
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automated.
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### src/qt/bitcoin.qrc
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This file must be updated whenever a new translation is added. Please note that
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files must end with `.qm`, not `.ts`.
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<qresource prefix="/translations">
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<file alias="en">locale/bitcoin_en.qm</file>
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...
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</qresource>
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### src/qt/locale/
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This directory contains all translations. Filenames must adhere to this format:
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bitcoin_xx_YY.ts or bitcoin_xx.ts
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#### bitcoin_en.ts (Source file)
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`src/qt/locale/bitcoin_en.ts` is treated in a special way. It is used as the
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source for all other translations. Whenever a string in the code is changed
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this file must be updated to reflect those changes. This can be accomplished
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by running `lupdate` (included in the Qt SDK). Also, a custom script is used
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to extract strings from the non-Qt parts:
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python share/qt/extract_strings_qt.py
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lupdate bitcoin-qt.pro -no-obsolete -locations none -ts src/qt/locale/bitcoin_en.ts
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##### Handling of plurals in the source file
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When new plurals are added to the source file, it's important to do the following steps:
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1. Open bitcoin_en.ts in Qt Linguist (also included in the Qt SDK)
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2. Search for `%n`, which will take you to the parts in the translation that use plurals
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3. Look for empty `English Translation (Singular)` and `English Translation (Plural)` fields
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4. Add the appropriate strings for the singular and plural form of the base string
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5. Mark the item as done (via the green arrow symbol in the toolbar)
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6. Repeat from step 2. until all singular and plural forms are in the source file
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7. Save the source file
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##### Creating the pull-request
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An updated source file should be merged to github and Transifex will pick it
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up from there (can take some hours). Afterwards the new strings show up as "Remaining"
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in Transifex and can be translated.
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To create the pull-request you have to do:
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git add src/qt/bitcoinstrings.cpp src/qt/locale/bitcoin_en.ts
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git commit
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Syncing with Transifex
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----------------------
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We are using https://transifex.com as a frontend for translating the client.
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https://www.transifex.com/projects/p/bitcoin/resource/tx/
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The "Transifex client" (see: http://help.transifex.com/features/client/)
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will help with fetching new translations from Transifex. Use the following
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config to be able to connect with the client:
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### .tx/config
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[main]
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host = https://www.transifex.com
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[bitcoin.tx]
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file_filter = src/qt/locale/bitcoin_<lang>.ts
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source_file = src/qt/locale/bitcoin_en.ts
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source_lang = en
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### .tx/config (for Windows)
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[main]
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host = https://www.transifex.com
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[bitcoin.tx]
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file_filter = src\qt\locale\bitcoin_<lang>.ts
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source_file = src\qt\locale\bitcoin_en.ts
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source_lang = en
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It is also possible to directly download new translations one by one from the Transifex website.
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### Fetching new translations
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1. `tx pull -a`
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2. update `src/qt/bitcoin.qrc` manually or via
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`ls src/qt/locale/*ts|xargs -n1 basename|sed 's/\(bitcoin_\(.*\)\).ts/<file alias="\2">locale/\1.qm<\/file>/'`
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3. `git add` new translations from `src/qt/locale/`
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