Correct the path to the docs file used by the doc generator
Clarify how to access tests

Add @marcelklehr’s clarification in https://github.com/ether/etherpad-lite/issues/1859
Merge pull request #1869 from codingisacopingstrategy/clarify-how-to-access-tests

Clarify how to acces tests
Merge pull request #1861 from codingisacopingstrategy/correct-path-in-readme-doc-generator

Correct the path to the docs file used by the doc generator
Update README.md
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fix padUsers http api call in PadMessageHandler.js.

Add callback() function call to iterator function.
Merge pull request #1874 from tonoman3g/fix-padUsers-http-api-call

fix padUsers http api call in PadMessageHandler.js.
Localisation updates from http://translatewiki.net.