diff --git a/libs/core/_locales/ar/microbit-strings.json b/libs/core/_locales/ar/core-strings.json
similarity index 100%
rename from libs/core/_locales/ar/microbit-strings.json
rename to libs/core/_locales/ar/core-strings.json
diff --git a/libs/core/_locales/microbit-jsdoc-strings.json b/libs/core/_locales/core-jsdoc-strings.json
similarity index 100%
rename from libs/core/_locales/microbit-jsdoc-strings.json
rename to libs/core/_locales/core-jsdoc-strings.json
diff --git a/libs/core/_locales/microbit-strings.json b/libs/core/_locales/core-strings.json
similarity index 100%
rename from libs/core/_locales/microbit-strings.json
rename to libs/core/_locales/core-strings.json
diff --git a/libs/core/_locales/de/microbit-strings.json b/libs/core/_locales/de/core-strings.json
similarity index 100%
rename from libs/core/_locales/de/microbit-strings.json
rename to libs/core/_locales/de/core-strings.json
diff --git a/libs/core/_locales/es-ES/microbit-strings.json b/libs/core/_locales/es-ES/core-strings.json
similarity index 100%
rename from libs/core/_locales/es-ES/microbit-strings.json
rename to libs/core/_locales/es-ES/core-strings.json
diff --git a/libs/core/_locales/fr/microbit-jsdoc-strings.json b/libs/core/_locales/fr/core-jsdoc-strings.json
similarity index 100%
rename from libs/core/_locales/fr/microbit-jsdoc-strings.json
rename to libs/core/_locales/fr/core-jsdoc-strings.json
diff --git a/libs/core/_locales/ja/microbit-strings.json b/libs/core/_locales/ja/core-jsdoc-strings.json
similarity index 100%
rename from libs/core/_locales/ja/microbit-strings.json
rename to libs/core/_locales/ja/core-jsdoc-strings.json
diff --git a/libs/core/_locales/ja/core-strings.json b/libs/core/_locales/ja/core-strings.json
new file mode 100644
index 00000000..ddd6ab34
--- /dev/null
+++ b/libs/core/_locales/ja/core-strings.json
@@ -0,0 +1,80 @@
+{
+  "Math.randomBoolean|block": "pick random true or false",
+  "Math|block": "Math",
+  "String.fromCharCode|block": "text from char code %code",
+  "String|block": "String",
+  "basic.clearScreen|block": "clear screen",
+  "basic.forever|block": "forever",
+  "basic.pause|block": "pause (ms) %pause",
+  "basic.showLeds|block": "show leds",
+  "basic.showNumber|block": "show|number %number",
+  "basic.showString|block": "show|string %text",
+  "basic|block": "basic",
+  "control.inBackground|block": "run in background",
+  "control.reset|block": "reset",
+  "control.waitMicros|block": "wait (µs)%micros",
+  "control|block": "control",
+  "game.addScore|block": "change score by|%points",
+  "game.gameOver|block": "game over",
+  "game.score|block": "score",
+  "game.startCountdown|block": "start countdown|(ms) %duration",
+  "game|block": "game",
+  "images.createBigImage|block": "create big image",
+  "images.createImage|block": "create image",
+  "images|block": "images",
+  "input.acceleration|block": "acceleration (mg)|%NAME",
+  "input.buttonIsPressed|block": "button|%NAME|is pressed",
+  "input.compassHeading|block": "compass heading (°)",
+  "input.lightLevel|block": "light level",
+  "input.magneticForce|block": "magnetic force (µT)|%NAME",
+  "input.onButtonPressed|block": "on button|%NAME|pressed",
+  "input.onGesture|block": "on |%NAME",
+  "input.onPinPressed|block": "on pin %NAME|pressed",
+  "input.onPinReleased|block": "on pin %NAME|released",
+  "input.pinIsPressed|block": "pin %NAME|is pressed",
+  "input.rotation|block": "rotation (°)|%NAME",
+  "input.runningTime|block": "running time (ms)",
+  "input.setAccelerometerRange|block": "set accelerometer|range %range",
+  "input.temperature|block": "temperature (°C)",
+  "input|block": "input",
+  "led.brightness|block": "brightness",
+  "led.plotBarGraph|block": "plot bar graph of %value |up to %high",
+  "led.plot|block": "plot|x %x|y %y",
+  "led.point|block": "point|x %x|y %y",
+  "led.setBrightness|block": "set brightness %value",
+  "led.stopAnimation|block": "stop animation",
+  "led.toggle|block": "toggle|x %x|y %y",
+  "led.unplot|block": "unplot|x %x|y %y",
+  "led|block": "led",
+  "music.beat|block": "%fraction|beat",
+  "music.changeTempoBy|block": "change tempo by (bpm)|%value",
+  "music.noteFrequency|block": "%note",
+  "music.playTone|block": "play|tone %note=device_note|for %duration=device_beat",
+  "music.rest|block": "rest(ms)|%duration=device_beat",
+  "music.ringTone|block": "ring tone (Hz)|%note=device_note",
+  "music.setTempo|block": "set tempo to (bpm)|%value",
+  "music.tempo|block": "tempo (bpm)",
+  "music|block": "music",
+  "pins.analogReadPin|block": "analog read|pin %name",
+  "pins.analogSetPeriod|block": "analog set period|pin %pin|to (µs)%micros",
+  "pins.analogWritePin|block": "analog write|pin %name|to %value",
+  "pins.digitalReadPin|block": "digital read|pin %name",
+  "pins.digitalWritePin|block": "digital write|pin %name|to %value",
+  "pins.i2cReadNumber|block": "i2c read number|at address %address|of format %format=i2c_sizeof",
+  "pins.i2cWriteNumber|block": "i2c write number|at address %address|with value %value|of format %format=i2c_sizeof",
+  "pins.map|block": "map %value|from low %fromLow|from high %fromHigh|to low %toLow|to high %toHigh",
+  "pins.onPulsed|block": "on|pin %pin|pulsed %pulse",
+  "pins.pulseDuration|block": "pulse duration (µs)",
+  "pins.servoSetPulse|block": "servo set pulse|pin %value|to (µs) %micros",
+  "pins.servoWritePin|block": "servo write|pin %name|to %value",
+  "pins.setPull|block": "set pull|pin %pin|to %pull",
+  "pins.spiWrite|block": "spi write %value",
+  "pins|block": "pins",
+  "serial.readLine|block": "serial read line",
+  "serial.redirect|block": "serial redirect to|TX %tx|RX %rx|at baud rate %rate",
+  "serial.writeLine|block": "serial|write line %text",
+  "serial.writeNumber|block": "serial|write number %value",
+  "serial.writeString|block": "serial write string %text",
+  "serial.writeValue|block": "serial|write value %name|= %value",
+  "serial|block": "serial"
+}
\ No newline at end of file
diff --git a/libs/core/pxt.json b/libs/core/pxt.json
index 16aeaeeb..2018911a 100644
--- a/libs/core/pxt.json
+++ b/libs/core/pxt.json
@@ -30,7 +30,9 @@
         "pxtparts.json",
         "parts/speaker.svg",
         "parts/headphone.svg",
-        "_locales/fr/microbit-jsdoc-strings.json"
+        "_locales/ja/core-jsdoc-strings.json",
+        "_locales/ja/core-strings.json",
+        "_locales/fr/core-jsdoc-strings.json"
     ],
     "public": true,
     "dependencies": {},