add Japanese localization

ShareExtension/ja.lproj/Localizable.stringsdict

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NFiles</key>
+	<dict>
+		<key>NSStringLocalizedFormatKey</key>
+		<string>%#@files@</string>
+		<key>files</key>
+		<dict>
+			<key>NSStringFormatSpecTypeKey</key>
+			<string>NSStringPluralRuleType</string>
+			<key>NSStringFormatValueTypeKey</key>
+			<string>d</string>
+			<key>one</key>
+			<string>%dつのファイル</string>
+			<key>other</key>
+			<string>%dつのファイル</string>
+		</dict>
+	</dict>
+</dict>
+</plist>

ShareExtension/ja.lproj/ShareViewController.strings

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+
+/* Class = "NSTextFieldCell"; title = "NearDrop"; ObjectID = "0xp-rC-2gr"; */
+"0xp-rC-2gr.title" = "NearDrop";
+
+/* Class = "NSButtonCell"; title = "Cancel"; ObjectID = "6Up-t3-mwm"; */
+"6Up-t3-mwm.title" = "キャンセル";
+
+/* Class = "NSTextFieldCell"; title = "Looking for devices..."; ObjectID = "NaJ-Wx-Pim"; */
+"NaJ-Wx-Pim.title" = "機器を探す中...";
+
+/* Class = "NSTextFieldCell"; title = "If you don't see your device, open \"Google Files\" app and tap \"Receive\" on the Nearby Share tab."; ObjectID = "vla-gF-eJo"; */
+"vla-gF-eJo.title" = "もしデバイスが表示されない場合は、「Files by Google」アプリを開き、右下にある「Nearby Share」から「受信」をタップしてください。";