More English updates - Sept 18, 2014

NOTE!  This commit includes text changes PLUS a structure change:

I removed the duplicate CheckBoxPreference entries for Text-to-Speech (ttsspeed, ttsavgspeed, and ttsremote) in pref.xml.

I noticed that new ones were inserted into a new <PreferenceCategory>, but the old ones were left outside of this new <PreferenceCategory>.

I hope these are correct. The other language pref.xml files also need the update.

Signed-off-by: Randy Schnedler <randypower@oscar.local>