diff --git a/locale/ja_JP.po b/locale/ja_JP.po
deleted file mode 100644
index 4ef666e46d..0000000000
--- a/locale/ja_JP.po
+++ /dev/null
@@ -1,149 +0,0 @@
-#
-msgid ""
-msgstr "Content-Type: text/plain; charset=utf-8\n"
-
-msgctxt "error:sale.promotion.coupon.number:"
-msgid "The coupon numbered '%(numbers)s' are duplicated."
-msgstr ""
-
-msgctxt "field:sale.promotion,coupons:"
-msgid "Coupons"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,create_date:"
-msgid "Create Date"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,create_uid:"
-msgid "Create User"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,id:"
-msgid "ID"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,name:"
-msgid "Name"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,number_of_use:"
-msgid "Number of Use"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,numbers:"
-msgid "Numbers"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,per_party:"
-msgid "Per Party"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,promotion:"
-msgid "Promotion"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,rec_name:"
-msgid "Record Name"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,write_date:"
-msgid "Write Date"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon,write_uid:"
-msgid "Write User"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,active:"
-msgid "Active"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,coupon:"
-msgid "Coupon"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,create_date:"
-msgid "Create Date"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,create_uid:"
-msgid "Create User"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,id:"
-msgid "ID"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,number:"
-msgid "Number"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,rec_name:"
-msgid "Record Name"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,write_date:"
-msgid "Write Date"
-msgstr ""
-
-msgctxt "field:sale.promotion.coupon.number,write_uid:"
-msgid "Write User"
-msgstr ""
-
-msgctxt "field:sale.sale,coupons:"
-msgid "Coupons"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,create_date:"
-msgid "Create Date"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,create_uid:"
-msgid "Create User"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,id:"
-msgid "ID"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,number:"
-msgid "Number"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,rec_name:"
-msgid "Record Name"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,sale:"
-msgid "Sale"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,write_date:"
-msgid "Write Date"
-msgstr ""
-
-msgctxt "field:sale.sale-sale.promotion.coupon.number,write_uid:"
-msgid "Write User"
-msgstr ""
-
-msgctxt "help:sale.promotion.coupon,number_of_use:"
-msgid ""
-"How much times a coupon number can be used.\n"
-"0 or below for no limit."
-msgstr ""
-
-msgctxt "help:sale.promotion.coupon,per_party:"
-msgid "Check to count usage per party."
-msgstr ""
-
-msgctxt "model:sale.promotion.coupon,name:"
-msgid "Promotion Coupon"
-msgstr ""
-
-msgctxt "model:sale.promotion.coupon.number,name:"
-msgid "Promotion Coupon Number"
-msgstr ""
-
-msgctxt "model:sale.sale-sale.promotion.coupon.number,name:"
-msgid "Sale - Promotion Coupon Number"
-msgstr ""