Support Spanish words like 'Señora' in the mb-de*-en voices.

phsource/mbrola/de2

 0  A~ NULL   0  a~
 0  O~ NULL   0  o~
 
+// phonemes for Spanish words
+0  e   NULL  0  E
+0  **  NULL  0  R
+0  n^  NULL  40 n j
+
 // phonemes for English words
 0  @L  NULL  50 @ l
 0  @2  NULL  0  @

phsource/mbrola/de4

 16  _| VWL    0  ?
 //16  _! VWL    0  ?
 
+// phonemes for Spanish words
+0  e   NULL  0  E
+0  **  NULL  0  R
+0  n^  NULL  40 n j
+
 // phonemes for English words
 0  @L  NULL  0  L
 0  @2  NULL  0  @

phsource/mbrola/de6

 0  A~ NULL   0  a~
 0  O~ NULL   0  o~
 
+// phonemes for Spanish words
+0  e   NULL  0  E
+0  **  NULL  0  R
+0  n^  NULL  40 n j
+
 // phonemes for English words
 0  @L  NULL  40 @ l
 0  m-  NULL  20 @ m