Remove unsupported ja_JP translations

locale/ja_JP.po

@@ -1,43 +0,0 @@
-#
-msgid ""
-msgstr "Content-Type: text/plain; charset=utf-8\n"
-
-msgctxt "field:project.work,cost:"
-msgid "Cost"
-msgstr ""
-
-msgctxt "field:project.work,currency_digits:"
-msgid "Currency Digits"
-msgstr ""
-
-msgctxt "field:project.work,list_price:"
-msgid "List Price"
-msgstr ""
-
-msgctxt "field:project.work,product:"
-msgid "Product"
-msgstr ""
-
-msgctxt "field:project.work,purchase_lines:"
-msgid "Purchase Lines"
-msgstr ""
-
-msgctxt "field:project.work,revenue:"
-msgid "Revenue"
-msgstr ""
-
-msgctxt "field:purchase.line,work:"
-msgid "Work Effort"
-msgstr ""
-
-msgctxt "help:purchase.line,work:"
-msgid "Add to the cost of the work effort."
-msgstr ""
-
-msgctxt "view:project.work:"
-msgid "Purchases"
-msgstr ""
-
-msgctxt "view:purchase.line:"
-msgid "Project"
-msgstr ""