Fix sugar3.speech.SpeechManager get all translated voices
Fix sugar3.speech.SpeechManager get all translated voices

- fix method name,

- return translated voices,

- low impact; method not yet used in any of the most frequently used
  activities,

- old method name retained for compatibility just in case, but
  deprecate.

sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3