Add ja_jp translations

Co-authored-by: Crowdin Bot <support+bot@crowdin.com>

Author: rubensworks

loader-common/src/main/resources/assets/structuredcrafting/lang/ja_jp.json

@@ -1 +1,5 @@
-{}
+{
+  "_comment": "Blocks",
+  "itemGroup.structuredcrafting": "Structured Crafting",
+  "block.structuredcrafting.structured_crafter": "構造作業台"
+}