mbrola: add mb-jp1, mb-jp2 and mb-jp3 voices

Makefile.am

 	espeak-ng-data/mbrola_ph/ir1_phtrans \
 	espeak-ng-data/mbrola_ph/it1_phtrans \
 	espeak-ng-data/mbrola_ph/it3_phtrans \
+	espeak-ng-data/mbrola_ph/jp_phtrans \
 	espeak-ng-data/mbrola_ph/la1_phtrans \
 	espeak-ng-data/mbrola_ph/lt_phtrans \
 	espeak-ng-data/mbrola_ph/mx1_phtrans \
 	mkdir -p espeak-ng-data/mbrola_ph
 	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/it3
 
+espeak-ng-data/mbrola_ph/jp_phtrans: phsource/mbrola/jp src/espeak-ng
+	mkdir -p espeak-ng-data/mbrola_ph
+	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/jp
+
 espeak-ng-data/mbrola_ph/la1_phtrans: phsource/mbrola/la1 src/espeak-ng
 	mkdir -p espeak-ng-data/mbrola_ph
 	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/la1

docs/mbrola.md

 | `it2`        | Italian              | female | `mb-it2` |                |
 | `it3`        | Italian              | male   | `mb-it3` | `mbrola-it3`   |
 | `it4`        | Italian              | female | `mb-it4` | `mbrola-it4`   |
-| `jp1`        | Japanese             | male   |          |                |
-| `jp2`        | Japanese             | female |          |                |
-| `jp3`        | Japanese             | female |          |                |
+| `jp1`        | Japanese             | male   | `mb-jp1` |                |
+| `jp2`        | Japanese             | female | `mb-jp2` |                |
+| `jp3`        | Japanese             | female | `mb-jp3` |                |
 | `la1`        | Classical Latin      | male   | `mb-la1` | `mbrola-la1`   |
 | `lt1`        | Lithuanian           | male   | `mb-lt1` | `mbrola-lt1`   |
 | `lt2`        | Lithuanian           | male   | `mb-lt2` | `mbrola-lt2`   |

espeak-ng-data/voices/mb/mb-jp1

+name japanese-mbrola-1
+language ja 1
+gender male
+mbrola jp1 jp_phtrans

espeak-ng-data/voices/mb/mb-jp2

+pitch 120 260
+name japanese-mbrola-2
+language ja 2
+gender female
+pitch 160 300
+mbrola jp2 jp_phtrans

espeak-ng-data/voices/mb/mb-jp3

+name japanese-mbrola-3
+language ja 3
+gender female
+pitch 160 300
+mbrola jp3 jp_phtrans

phsource/mbrola/jp

+volume 15
+
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