diff --git a/langfilter/lang/ja/messages.po b/langfilter/lang/ja/messages.po
new file mode 100644
index 00000000..5d699d04
--- /dev/null
+++ b/langfilter/lang/ja/messages.po
@@ -0,0 +1,76 @@
+# ADDON langfilter
+# Copyright (C)
+# This file is distributed under the same license as the Friendica langfilter addon package.
+# 
+# 
+# Translators:
+# XMPPはいいぞ, 2021
+msgid ""
+msgstr ""
+"Project-Id-Version: friendica\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2021-02-01 18:15+0100\n"
+"PO-Revision-Date: 2021-08-06 05:49+0000\n"
+"Last-Translator: XMPPはいいぞ\n"
+"Language-Team: Japanese (http://www.transifex.com/Friendica/friendica/language/ja/)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: ja\n"
+"Plural-Forms: nplurals=1; plural=0;\n"
+
+#: langfilter.php:50
+msgid "Language Filter"
+msgstr "言語フィルタ"
+
+#: langfilter.php:51
+msgid ""
+"This addon tries to identify the language posts are written in. If it does "
+"not match any language specified below, posts will be hidden by collapsing "
+"them."
+msgstr "このアドオンは、投稿が書かれている言語の特定を試みます。以下に指定されたどの言語にも一致しない場合、投稿は折り畳まれて隠されます。"
+
+#: langfilter.php:52
+msgid "Use the language filter"
+msgstr "言語フィルタを使う"
+
+#: langfilter.php:53
+msgid "Able to read"
+msgstr "読めるもの"
+
+#: langfilter.php:53
+msgid ""
+"List of abbreviations (ISO 639-1 codes) for languages you speak, comma "
+"separated. For example \"de,it\"."
+msgstr "あなたが話す言語の略語（ISO 639-1コード）の一覧をカンマで区切ってください。例えば、\"de,it\"。"
+
+#: langfilter.php:54
+msgid "Minimum confidence in language detection"
+msgstr "言語検出の最低信頼度"
+
+#: langfilter.php:54
+msgid ""
+"Minimum confidence in language detection being correct, from 0 to 100. Posts"
+" will not be filtered when the confidence of language detection is below "
+"this percent value."
+msgstr "言語検出が正しいことを示す最小の信頼度を0から100までで指定します。言語検出の信頼度がこの百分率の値以下の場合、投稿はフィルタリングされません。"
+
+#: langfilter.php:55
+msgid "Minimum length of message body"
+msgstr "メッセージ本文の最低の長さ"
+
+#: langfilter.php:55
+msgid ""
+"Minimum number of characters in message body for filter to be used. Posts "
+"shorter than this will not be filtered. Note: Language detection is "
+"unreliable for short content (<200 characters)."
+msgstr "フィルタを使用するためのメッセージ本文の最小文字数。これより短い投稿はフィルタリングされません。注：短いコンテンツ（200文字未満）の場合、言語検出は信頼できません。"
+
+#: langfilter.php:56
+msgid "Save Settings"
+msgstr "設定を保存"
+
+#: langfilter.php:187
+#, php-format
+msgid "Filtered language: %s"
+msgstr ""
diff --git a/langfilter/lang/ja/strings.php b/langfilter/lang/ja/strings.php
new file mode 100644
index 00000000..93c02521
--- /dev/null
+++ b/langfilter/lang/ja/strings.php
@@ -0,0 +1,18 @@
+<?php
+
+if(! function_exists("string_plural_select_ja")) {
+function string_plural_select_ja($n){
+	$n = intval($n);
+	return intval(0);
+}}
+;
+$a->strings["Language Filter"] = "言語フィルタ";
+$a->strings["This addon tries to identify the language posts are written in. If it does not match any language specified below, posts will be hidden by collapsing them."] = "このアドオンは、投稿が書かれている言語の特定を試みます。以下に指定されたどの言語にも一致しない場合、投稿は折り畳まれて隠されます。";
+$a->strings["Use the language filter"] = "言語フィルタを使う";
+$a->strings["Able to read"] = "読めるもの";
+$a->strings["List of abbreviations (ISO 639-1 codes) for languages you speak, comma separated. For example \"de,it\"."] = "あなたが話す言語の略語（ISO 639-1コード）の一覧をカンマで区切ってください。例えば、\"de,it\"。";
+$a->strings["Minimum confidence in language detection"] = "言語検出の最低信頼度";
+$a->strings["Minimum confidence in language detection being correct, from 0 to 100. Posts will not be filtered when the confidence of language detection is below this percent value."] = "言語検出が正しいことを示す最小の信頼度を0から100までで指定します。言語検出の信頼度がこの百分率の値以下の場合、投稿はフィルタリングされません。";
+$a->strings["Minimum length of message body"] = "メッセージ本文の最低の長さ";
+$a->strings["Minimum number of characters in message body for filter to be used. Posts shorter than this will not be filtered. Note: Language detection is unreliable for short content (<200 characters)."] = "フィルタを使用するためのメッセージ本文の最小文字数。これより短い投稿はフィルタリングされません。注：短いコンテンツ（200文字未満）の場合、言語検出は信頼できません。";
+$a->strings["Save Settings"] = "設定を保存";