i18n: Updates for project Deepin Desktop Environment (#331)

* [skip CI] Translate trayplugin-loader.ts in ja

66% of minimum 50% translated source file: 'trayplugin-loader.ts'
on 'ja'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

* [skip CI] Translate trayplugin-loader.ts in ja

100% translated source file: 'trayplugin-loader.ts'
on 'ja'.

* [skip CI] Translate dde-dock.ts in pl

100% translated source file: 'dde-dock.ts'
on 'pl'.

* [skip CI] Removing dde-dock.ts in pl

100% translated source file: 'dde-dock.ts'
on 'pl'.

---------

Log:

Author: transifex-integration[bot]

src/loader/translations/trayplugin-loader_ja.ts

@@ -0,0 +1,23 @@
+<?xml version="1.0" ?><!DOCTYPE TS><TS version="2.1" language="ja">
+<context>
+    <name>PluginItem</name>
+    <message>
+        <location filename="../pluginitem.cpp" line="89"/>
+        <source>Remove from dock</source>
+        <translation>ドックから削除</translation>
+    </message>
+</context>
+<context>
+    <name>QuickPluginItem</name>
+    <message>
+        <location filename="../quickpluginitem.cpp" line="160"/>
+        <source>Remove from dock</source>
+        <translation>ドックから削除</translation>
+    </message>
+    <message>
+        <location filename="../quickpluginitem.cpp" line="160"/>
+        <source>Pin to dock</source>
+        <translation>ドックに固定</translation>
+    </message>
+</context>
+</TS>