Created Instructions for Translators (markdown)

Instructions-for-Translators.md

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+We use [Transifex](https://www.transifex.com) to manage the project's translations. If you want to contribute, please setup an account there and request to join us at https://www.transifex.com/projects/p/sapl.
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+Once accepted, readily start to translate on the service itself. To see your translations on a working instance do the following:
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+* Install the development environment, following the instructions at [Development Environment Setup](Development-Environment-Setup)
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+* Install [Transifex Client](http://docs.transifex.com/client/config/)
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+* Pull and push translations on the local project using `tx pull` and `tx push`.
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