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Many existing translations need to be updated and new languages are welcome.
Why this is important
The future of Bitcoin is closely related to decentralization. Not just the network, but the jurisdiction of all of its users, miners and businesses. Widespread adoption increases resilience and provides incentives for countries and businesses to compete in a free market. Making sure everyone can benefit from Bitcoin is also important to create a fair and sustainable economy. Yet, most countries don't have as much information available in their own languages. Bitcoin.org can help to make a difference on this level. Bitcoin.org is one of the most visited website in the world, this is an incredible chance and opportunity for the Bitcoin community.
How to help
If you speak a language other than English, or if you know anyone who does and would want to participate, You can go to Transifex : https://www.transifex.com/projects/p/bitcoinorg/ and click to join the team for your language. You can then review / improve existing translations and translate additional texts that are still not translated. New coordinators (with a good level of experience for their respective language) would be helpful for some of these teams.
When a translation is nearly complete, I usually create an editable live preview to help translators to complete their work. A few good quality translation is always worth more than many poor quality translations. All texts need to be translated and reviewed by at least two different persons (peer-reviewed), unless perhaps if you're a professional translator. It's also always welcome to ask for questions if you are unsure about anything, this can help preventing accidental changes in the meaning of some statements.
BTW, there is also many other projects listed on this page which can be translated:
http://bitcoin.org/en/support-bitcoin
Donations / Bounties
Feel free to offer a bounty if you want to incentivize people to work on translations. You can also send some tips to this address ( 112ypbXZSUnJvbAvzMNSoxHV6uJM77LSAk ) and let me know what language you want to support the most. I'll redirect these tips at the most active contributors (I'll do my best to be fair, and also keep some tips for previous most active translators who worked for free). You're also very welcome if you want to pay a professional translator directly (here's one accepting bitcoins http://hyperwyrm.co.uk/) . With the recent rise in the price, there is probably some bit-millionaire who would like to help Bitcoin reaching new horizons?
Edit: 34 mBTC donated so far, thanks!
Some priorities
These languages really need to be updated since a while:
Spanish
Polish
Russian
Chinese (Taiwan)
Persian
Arabic
Indonesian
These languages could be added soon with some help:
Japanese
Portuguese (Brazil)
Korean Resumen:Si sabes Ingles y Español (ES) puedes ayudar a traduccir Bitcoin.org registrandote en
https://www.transifex.com/projects/p/bitcoinorg/Una vez registrado unete al proyecto de traducción y empieza a traducir algunas frases.
No se necesita gran nivel de ingles (algunas traducciones son sencillas) pero si que se necesita profesionalidad a la hora de escribir en Español (ortografía correcta, etc).