diff --git a/editor/locale/README.txt b/editor/locale/README.txt
index 7381d3fd..298f52c4 100644
--- a/editor/locale/README.txt
+++ b/editor/locale/README.txt
@@ -9,8 +9,9 @@ Languages Already Translated By Humans:
   * lang.cs.js
   * lang.de.js
   * lang.en.js
-  * lang.es.js  
+  * lang.es.js
   * lang.fr.js
+  * lang.ja.js
   * lang.nl.js
   * lang.ro.js
   * lang.sk.js
diff --git a/editor/locale/lang.ja.js b/editor/locale/lang.ja.js
index f4c7932b..d96e3b4d 100644
--- a/editor/locale/lang.ja.js
+++ b/editor/locale/lang.ja.js
@@ -1,156 +1,156 @@
 [
-{"id": "align_relative_to", "title": "整列するために相対的な ..."},
-{"id": "angle", "title": "変更の回転角"},
+{"id": "align_relative_to", "title": "揃える"},
+{"id": "angle", "title": "回転角の変更"},
 {"id": "angleLabel", "textContent": "角度:"},
-{"id": "bkgnd_color", "title": "変更の背景色/不透明度"},
-{"id": "circle_cx", "title": "変更円の佐川急便の座標"},
-{"id": "circle_cy", "title": "変更サークルサイ座標"},
+{"id": "bkgnd_color", "title": "背景色/不透明度の変更"},
+{"id": "circle_cx", "title": "円の中心を変更（X座標）"},
+{"id": "circle_cy", "title": "円の中心を変更（Y座標）"},
 {"id": "circle_r", "title": "変更円の半径"},
-{"id": "cornerRadiusLabel", "textContent": "コーナー半径："},
-{"id": "curve_segments", "textContent": "Curve"},
-{"id": "ellipse_cx", "title": "の座標佐川急便楕円を変更する"},
-{"id": "ellipse_cy", "title": "変更楕円サイ座標"},
-{"id": "ellipse_rx", "title": "変更する楕円のx半径"},
-{"id": "ellipse_ry", "title": "変更する楕円のy半径"},
-{"id": "fill_color", "title": "変更の塗りつぶしの色"},
-{"id": "fill_tool_bottom", "textContent": "満ちる:"},
-{"id": "fitToContent", "textContent": "フィットコンテンツへ"},
-{"id": "fit_to_all", "textContent": "フィットすべてのコンテンツに"},
-{"id": "fit_to_canvas", "textContent": "フィットキャンバスに"},
-{"id": "fit_to_layer_content", "textContent": "に合うようにレイヤーのコンテンツ"},
-{"id": "fit_to_sel", "textContent": "フィットを選択する"},
-{"id": "font_family", "title": "フォントの変更ご家族"},
+{"id": "cornerRadiusLabel", "textContent": "角の半径："},
+{"id": "curve_segments", "textContent": "カーブ"},
+{"id": "ellipse_cx", "title": "楕円の中心を変更（X座標）"},
+{"id": "ellipse_cy", "title": "楕円の中心を変更（Y座標）"},
+{"id": "ellipse_rx", "title": "楕円の半径を変更（X座標）"},
+{"id": "ellipse_ry", "title": "楕円の半径を変更（Y座標）"},
+{"id": "fill_color", "title": "塗りの色を変更"},
+{"id": "fill_tool_bottom", "textContent": "塗り:"},
+{"id": "fitToContent", "textContent": "コンテンツに合わせる"},
+{"id": "fit_to_all", "textContent": "すべてのコンテンツに合わせる"},
+{"id": "fit_to_canvas", "textContent": "キャンバスに合わせる"},
+{"id": "fit_to_layer_content", "textContent": "レイヤー上のコンテンツに合わせる"},
+{"id": "fit_to_sel", "textContent": "選択対象に合わせる"},
+{"id": "font_family", "title": "フォントファミリーの変更"},
 {"id": "font_size", "title": "文字サイズの変更"},
-{"id": "group_opacity", "title": "変更項目の不透明度を選択"},
+{"id": "group_opacity", "title": "不透明度"},
 {"id": "icon_large", "textContent": "Large"},
 {"id": "icon_medium", "textContent": "Medium"},
 {"id": "icon_small", "textContent": "Small"},
 {"id": "icon_xlarge", "textContent": "Extra Large"},
 {"id": "iheightLabel", "textContent": "高さ:"},
-{"id": "image_height", "title": "変更するイメージの高さ"},
-{"id": "image_opt_embed", "textContent": "Embed data (local files)"},
-{"id": "image_opt_ref", "textContent": "Use file reference"},
+{"id": "image_height", "title": "画像の高さを変更"},
+{"id": "image_opt_embed", "textContent": "SVGファイルに埋め込む"},
+{"id": "image_opt_ref", "textContent": "画像を参照する"},
 {"id": "image_url", "title": "URLを変更"},
-{"id": "image_width", "title": "変更するイメージの幅"},
-{"id": "includedImages", "textContent": "Included Images"},
+{"id": "image_width", "title": "画像の幅を変更"},
+{"id": "includedImages", "textContent": "挿入された画像の扱い"},
 {"id": "iwidthLabel", "textContent": "幅:"},
 {"id": "largest_object", "textContent": "最大のオブジェクト"},
-{"id": "layer_delete", "title": "レイヤーの削除"},
-{"id": "layer_down", "title": "レイヤ下へ移動"},
-{"id": "layer_new", "title": "New Layer"},
-{"id": "layer_rename", "title": "名前を変更するレイヤ"},
-{"id": "layer_up", "title": "最大のレイヤに移動"},
-{"id": "layersLabel", "textContent": "層:"},
-{"id": "line_x1", "title": "変更行のx座標を開始"},
-{"id": "line_x2", "title": "変更行のx座標を終了"},
-{"id": "line_y1", "title": "変更直線y開始の座標"},
-{"id": "line_y2", "title": "変更直線y期の座標"},
+{"id": "layer_delete", "title": "レイヤの削除"},
+{"id": "layer_down", "title": "レイヤを下へ移動"},
+{"id": "layer_new", "title": "新規レイヤ"},
+{"id": "layer_rename", "title": "レイヤの名前を変更"},
+{"id": "layer_up", "title": "レイヤを上へ移動"},
+{"id": "layersLabel", "textContent": "レイヤ:"},
+{"id": "line_x1", "title": "開始X座標"},
+{"id": "line_x2", "title": "終了X座標"},
+{"id": "line_y1", "title": "開始Y座標"},
+{"id": "line_y2", "title": "終了Y座標"},
 {"id": "page", "textContent": "ページ"},
-{"id": "palette", "title": "をクリックして、色、シフトを埋めるストロークの色を変更するをクリックして変更する"},
-{"id": "path_node_x", "title": "Change node's x coordinate"},
-{"id": "path_node_y", "title": "Change node's y coordinate"},
-{"id": "rect_height", "title": "変更する四角形の高さ"},
-{"id": "rect_rx", "title": "変更長方形コーナー半径"},
-{"id": "rect_width", "title": "変更する長方形の幅"},
+{"id": "palette", "title": "クリックで塗りの色を選択、Shift+クリックで線の色を選択"},
+{"id": "path_node_x", "title": "ノードのX座標を変更"},
+{"id": "path_node_y", "title": "ノードのY座標を変更"},
+{"id": "rect_height", "title": "長方形の高さを変更"},
+{"id": "rect_rx", "title": "長方形の角の半径を変更"},
+{"id": "rect_width", "title": "長方形の幅を変更"},
 {"id": "relativeToLabel", "textContent": "相対:"},
 {"id": "rheightLabel", "textContent": "高さ："},
 {"id": "rwidthLabel", "textContent": "幅："},
-{"id": "seg_type", "title": "Change Segment type"},
-{"id": "selLayerLabel", "textContent": "Move elements to:"},
-{"id": "selLayerNames", "title": "Move selected elements to a different layer"},
-{"id": "selectedPredefined", "textContent": "を選択する事前定義された:"},
-{"id": "selected_objects", "textContent": "選ばれたオブジェクト"},
-{"id": "selected_x", "title": "Change X coordinate"},
-{"id": "selected_y", "title": "Change Y coordinate"},
+{"id": "seg_type", "title": "線分の種類を変更"},
+{"id": "selLayerLabel", "textContent": "移動先レイヤ:"},
+{"id": "selLayerNames", "title": "選択対象を別のレイヤに移動"},
+{"id": "selectedPredefined", "textContent": "デフォルト"},
+{"id": "selected_objects", "textContent": "選択オブジェクト"},
+{"id": "selected_x", "title": "X座標を変更"},
+{"id": "selected_y", "title": "Y座標を変更"},
 {"id": "smallest_object", "textContent": "最小のオブジェクト"},
-{"id": "straight_segments", "textContent": "Straight"},
-{"id": "stroke_color", "title": "変更ストロークの色"},
-{"id": "stroke_style", "title": "変更ストロークダッシュスタイル"},
-{"id": "stroke_tool_bottom", "textContent": "打撃:"},
-{"id": "stroke_width", "title": "変更ストローク幅"},
-{"id": "svginfo_bg_note", "textContent": "Note: Background will not be saved with image."},
-{"id": "svginfo_change_background", "textContent": "Editor Background"},
-{"id": "svginfo_dim", "textContent": "Canvas Dimensions"},
-{"id": "svginfo_editor_prefs", "textContent": "Editor Preferences"},
+{"id": "straight_segments", "textContent": "直線"},
+{"id": "stroke_color", "title": "線の色を変更"},
+{"id": "stroke_style", "title": "線種の変更"},
+{"id": "stroke_tool_bottom", "textContent": "線:"},
+{"id": "stroke_width", "title": "線幅の変更"},
+{"id": "svginfo_bg_note", "textContent": "※背景色はファイルに保存されません。"},
+{"id": "svginfo_change_background", "textContent": "エディタの背景色"},
+{"id": "svginfo_dim", "textContent": "キャンバスの大きさ"},
+{"id": "svginfo_editor_prefs", "textContent": "エディタの設定"},
 {"id": "svginfo_height", "textContent": "高さ:"},
-{"id": "svginfo_icons", "textContent": "Icon size"},
-{"id": "svginfo_image_props", "textContent": "Image Properties"},
-{"id": "svginfo_lang", "textContent": "Language"},
-{"id": "svginfo_title", "textContent": "Title"},
+{"id": "svginfo_icons", "textContent": "アイコンの大きさ"},
+{"id": "svginfo_image_props", "textContent": "イメージの設定"},
+{"id": "svginfo_lang", "textContent": "言語"},
+{"id": "svginfo_title", "textContent": "タイトル"},
 {"id": "svginfo_width", "textContent": "幅:"},
-{"id": "text", "title": "変更するテキストの内容"},
+{"id": "text", "title": "テキストの内容の変更"},
 {"id": "tool_alignbottom", "title": "下揃え"},
 {"id": "tool_aligncenter", "title": "中央揃え"},
 {"id": "tool_alignleft", "title": "左揃え"},
-{"id": "tool_alignmiddle", "title": "整列中東"},
+{"id": "tool_alignmiddle", "title": "中央揃え"},
 {"id": "tool_alignright", "title": "右揃え"},
-{"id": "tool_aligntop", "title": "整列トップ"},
-{"id": "tool_bold", "title": "太字テキスト"},
-{"id": "tool_circle", "title": "サークル"},
-{"id": "tool_clear", "textContent": "新しいイメージ"},
-{"id": "tool_clone", "title": "クローン要素"},
-{"id": "tool_clone_multi", "title": "クローンの要素"},
-{"id": "tool_delete", "title": "削除する要素"},
-{"id": "tool_delete_multi", "title": "Delete Selected Elements"},
+{"id": "tool_aligntop", "title": "上揃え"},
+{"id": "tool_bold", "title": "太字"},
+{"id": "tool_circle", "title": "円"},
+{"id": "tool_clear", "textContent": "新規イメージ"},
+{"id": "tool_clone", "title": "複製"},
+{"id": "tool_clone_multi", "title": "選択対象を複製"},
+{"id": "tool_delete", "title": "削除"},
+{"id": "tool_delete_multi", "title": "選択対象を削除"},
 {"id": "tool_docprops", "textContent": "文書のプロパティ"},
 {"id": "tool_docprops_cancel", "textContent": "キャンセル"},
 {"id": "tool_docprops_save", "textContent": "OK"},
 {"id": "tool_ellipse", "title": "楕円"},
 {"id": "tool_fhellipse", "title": "フリーハンド楕円"},
 {"id": "tool_fhpath", "title": "鉛筆ツール"},
-{"id": "tool_fhrect", "title": "フリーハンドのRectangle"},
-{"id": "tool_group", "title": "グループ要素"},
+{"id": "tool_fhrect", "title": "フリーハンド長方形"},
+{"id": "tool_group", "title": "グループ化"},
 {"id": "tool_image", "title": "イメージツール"},
-{"id": "tool_italic", "title": "イタリック体のテキスト"},
-{"id": "tool_line", "title": "ラインツール"},
-{"id": "tool_move_bottom", "title": "下に移動"},
-{"id": "tool_move_top", "title": "トップに移動します。"},
-{"id": "tool_node_clone", "title": "Clone Node"},
-{"id": "tool_node_delete", "title": "Delete Node"},
-{"id": "tool_node_link", "title": "Link Control Points"},
-{"id": "tool_open", "textContent": "[イメージを開く"},
-{"id": "tool_path", "title": "Path tool"},
-{"id": "tool_rect", "title": "四角形"},
-{"id": "tool_redo", "title": "REDOログ"},
-{"id": "tool_reorient", "title": "Reorient path"},
+{"id": "tool_italic", "title": "イタリック体"},
+{"id": "tool_line", "title": "直線ツール"},
+{"id": "tool_move_bottom", "title": "奥に移動"},
+{"id": "tool_move_top", "title": "手前に移動"},
+{"id": "tool_node_clone", "title": "ノードを複製"},
+{"id": "tool_node_delete", "title": "ノードを削除"},
+{"id": "tool_node_link", "title": "制御点の接続"},
+{"id": "tool_open", "textContent": "イメージを開く"},
+{"id": "tool_path", "title": "パスツール"},
+{"id": "tool_rect", "title": "長方形"},
+{"id": "tool_redo", "title": "やり直し"},
+{"id": "tool_reorient", "title": "現在の角度を０度とする"},
 {"id": "tool_save", "textContent": "画像を保存"},
 {"id": "tool_select", "title": "選択ツール"},
-{"id": "tool_source", "title": "[編集]ソース"},
+{"id": "tool_source", "title": "ソースの編集"},
 {"id": "tool_source_cancel", "textContent": "キャンセル"},
-{"id": "tool_source_save", "textContent": "Apply Changes"},
-{"id": "tool_square", "title": "広場"},
+{"id": "tool_source_save", "textContent": "適用"},
+{"id": "tool_square", "title": "正方形"},
 {"id": "tool_text", "title": "テキストツール"},
-{"id": "tool_topath", "title": "Convert to Path"},
+{"id": "tool_topath", "title": "パスに変換"},
 {"id": "tool_undo", "title": "元に戻す"},
-{"id": "tool_ungroup", "title": "グループ化を解除要素"},
-{"id": "tool_wireframe", "title": "Wireframe Mode [F]"},
+{"id": "tool_ungroup", "title": "グループ化を解除"},
+{"id": "tool_wireframe", "title": "ワイヤーフレームで表示 [F]"},
 {"id": "tool_zoom", "title": "ズームツール"},
-{"id": "zoom", "title": "変更のズームレベル"},
+{"id": "zoom", "title": "ズーム倍率の変更"},
 {"id": "zoomLabel", "textContent": "ズーム:"},
-{"id": "sidepanel_handle", "textContent": "L a y e r s", "title": "Drag left/right to resize side panel"},
+{"id": "sidepanel_handle", "textContent": "L a y e r s", "title": "ドラッグで幅の調整"},
 {
  "js_strings": {
-  "QerrorsRevertToSource": "There were parsing errors in your SVG source.\nRevert back to original SVG source?", 
-  "QignoreSourceChanges": "Ignore changes made to SVG source?", 
-  "QmoveElemsToLayer": "Move selected elements to layer '%s'?", 
-  "QwantToClear": "Do you want to clear the drawing?\nThis will also erase your undo history!", 
-  "cancel": "Cancel", 
-  "dupeLayerName": "There is already a layer named that!", 
-  "enterNewImgURL": "Enter the new image URL", 
-  "enterNewLayerName": "Please enter the new layer name", 
-  "enterUniqueLayerName": "Please enter a unique layer name", 
-  "featNotSupported": "Feature not supported", 
-  "invalidAttrValGiven": "Invalid value given", 
+  "QerrorsRevertToSource": "ソースにエラーがあります。\n元のソースに戻しますか？", 
+  "QignoreSourceChanges": "ソースの変更を無視しますか？", 
+  "QmoveElemsToLayer": "選択した要素をレイヤー '%s' に移動しますか？", 
+  "QwantToClear": "キャンバスをクリアしますか？\nアンドゥ履歴も消去されます。", 
+  "cancel": "キャンセル", 
+  "dupeLayerName": "同名のレイヤーが既に存在します。", 
+  "enterNewImgURL": "画像のURLを入力してください。", 
+  "enterNewLayerName": "レイヤの新しい名前を入力してください。", 
+  "enterUniqueLayerName": "新規レイヤの一意な名前を入力してください。", 
+  "featNotSupported": "機能はサポートされていません。", 
+  "invalidAttrValGiven": "無効な値が指定されています。", 
   "key_backspace": "backspace", 
   "key_del": "delete", 
   "key_down": "down", 
   "key_up": "up", 
-  "layer": "Layer", 
-  "layerHasThatName": "Layer already has that name", 
-  "noContentToFitTo": "No content to fit to", 
+  "layer": "レイヤ", 
+  "layerHasThatName": "既に同名が付いています。", 
+  "noContentToFitTo": "合わせる対象のコンテンツがありません。", 
   "ok": "OK", 
-  "pathCtrlPtTooltip": "Drag control point to adjust curve properties", 
-  "pathNodeTooltip": "Drag node to move it. Double-click node to change segment type"
+  "pathCtrlPtTooltip": "カーブの形状を調整するには、制御点をドラッグしてください。", 
+  "pathNodeTooltip": "移動するには、ノードをドラッグしてください。ノードをダブルクリックすると線分の種類を変更できます。"
  }
 }
 ]
\ No newline at end of file