LatinIME: Add accents to german keyboard

This fixes http://code.google.com/p/android/issues/detail?id=26247

Patch set 1 - Add
              // U+00E9: "é" LATIN SMALL LETTER E WITH ACUTE
              // U+00E8: "è" LATIN SMALL LETTER E WITH GRAVE
              // U+00EA: "ê" LATIN SMALL LETTER E WITH CIRCUMFLEX
              // U+00EB: "ë" LATIN SMALL LETTER E WITH DIAERESIS

Change-Id: Ic16c7b4b2b52d56ba88fe1dbc5bbc9c227d6d867