getting_involved: Add TRANSLATING.md

doc/getting_involved/TRANSLATING.md

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+Translating
+===========
+
+This document holds instructions to get you started with translating coala.
+coala uses gettext for translations so they are stored in `.po` files.
+
+Getting a Translation Environment
+---------------------------------
+
+You are free to use any translation environment you want.
+
+We recomment to grab and install Poedit from http://poedit.net/.
+
+Translating coala
+-----------------
+
+Our translation files lie in our `locale` directory and are named as usual.
+(E.g. german is `de_DE.po`, binary `.mo` files do not lie in the repository and are
+generated at installation time.)
+
+The translation process should be straightforward in Poedit or arbitrary other
+translation environments.
+
+Submitting Translations
+-----------------------
+
+The easiest way to submit translations is via a GitHub pull request. However,
+if this is inconvenient to you, you can send us your `.po` file via email
+to <lasse.schuirmann@gmail.com> or any other coala developer.