Merge pull request #617 from tcatm/translations-readme

add doc/translation_process.md

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+Translations
+============
+
+The QT GUI can be easily be translated into other languages. Here's how we
+handle those translations.
+
+Files and Folders
+-----------------
+
+### bitcoin-qt.pro
+
+This file takes care of generating `.qm` files from `.ts` files. It is mostly
+automated.
+
+### src/qt/bitcoin.qrc
+
+This file must be updated whenever a new translation is added. Please note that
+files must end with `.qm`, not `.ts`.
+
+    <qresource prefix="/translations">
+        <file alias="en">locale/bitcoin_en.qm</file>
+        ...
+    </qresource>
+
+### src/qt/locale/
+
+This directory contains all translations. Filenames must adhere to this format:
+
+    bitcoin_xx_YY.ts or bitcoin_xx.ts
+
+#### Source file
+
+`src/qt/locale/bitcoin_en.ts` is a treated in a special way. It is used as the
+source for all other translations. Whenever a string in the code is change
+this file must be updated to reflect those changes. Usually, this can be
+accomplished by running `lupdate`
+
+Syncing with transifex
+----------------------
+
+We are using http://transifex.net as a frontend for translating the client.
+
+https://www.transifex.net/projects/p/bitcoin/resource/tx/
+
+The "transifex client":http://help.transifex.net/features/client/index.html
+will help with fetching new translations from transifex.
+
+
+### .tx/config
+
+    [main]
+    host = https://www.transifex.net
+
+    [bitcoin.tx]
+    file_filter = src/qt/locale/bitcoin_<lang>.ts
+    source_file = src/qt/locale/bitcoin_en.ts
+    source_lang = en
+
+### Fetching new translations
+
+1. `tx pull -a`
+2. update `src/qt/bitcoin.qrc`
+3. `git add` new translations from `src/qt/locale/`