Added Telephony change option#4

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GeNyaa wants to merge 5 commits intoremotelearner:MOODLE_34_STABLEfrom

GeNyaa:MOODLE_34_STABLE

Commits on Jul 12, 2018

Added Telephony change option. Does not locally save information yet.
Auke de Jong
committed
added audiosetting to upgrade.php
Auke de Jong
committed
absolute path fixes
Auke de Jong
committed

Commits on Jul 13, 2018

Use language string instead of in code.
Auke de Jong
committed
version bump for language file
Auke de Jong
committed