New features and minor fix

New features:
in words.html
#line 201, 202, 206: "Next button" text changes for new keyboard
shortcuts
#line 266~281: new keyboard shortcuts
#line 303, 304: buttons initial text changes

in words.xml
#line 890~896: missing word added
#line 1585: correct missing content in tag <option>
#line 1720~1726: missing word added