Translated using Weblate (#5634)

Co-authored-by: Lasse Edsvik <lasse@lasseedsvik.se>
Co-authored-by: Lenny Angst <lenny@familie-angst.ch>
Co-authored-by: Py- Droid <droidpy587@gmail.com>
Co-authored-by: Ryohei Morimoto <caulked.thorax_3l@icloud.com>
Co-authored-by: WastedInside <arvidsloc@gmail.com>
Co-authored-by: oneshotkot <oneshotkot@gmail.com>
Co-authored-by: zhao rongkuan (kuank) <zhaorongkuan2011@gmail.com>
Co-authored-by: Максим Горпиніч <gorpinicmaksim0@gmail.com>

translations/plugins.ja.xlf

@@ -6,6 +6,14 @@
         <source>plugin.none_installed</source>
         <target>インストールされたプラグインは存在しません。</target>
       </trans-unit>
+      <trans-unit id="zVtBsSo" resname="plugin.marketplace" xml:space="preserve">
+        <source>Available plugins</source>
+        <target state="translated">利用可能なプラグイン</target>
+      </trans-unit>
+      <trans-unit id="6Bl7IPj" resname="buy" xml:space="preserve">
+        <source>Buy now</source>
+        <target state="translated">今すぐ購入</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>