diff --git a/src/dict/aard.cc b/src/dict/aard.cc
index 72597ee5..a87f3469 100644
--- a/src/dict/aard.cc
+++ b/src/dict/aard.cc
@@ -560,11 +560,11 @@ QString const& AardDictionary::getDescription()
     {
         map< string, string >::const_iterator iter = meta.find( "copyright" );
         if( iter != meta.end() )
-          dictionaryDescription = QString( QObject::tr( "Copyright: %1%2" ) ).arg( QString::fromUtf8( iter->second.c_str() ) ).arg( "\n\n" );
+          dictionaryDescription =  QObject::tr( "Copyright: %1%2" ).arg( QString::fromUtf8( iter->second.c_str() ) ).arg( "\n\n" );
 
         iter = meta.find( "version" );
         if( iter != meta.end() )
-          dictionaryDescription = QString( QObject::tr( "Version: %1%2" ) ).arg( QString::fromUtf8( iter->second.c_str() ) ).arg( "\n\n" );
+          dictionaryDescription = QObject::tr( "Version: %1%2" ).arg( QString::fromUtf8( iter->second.c_str() ) ).arg( "\n\n" );
 
         iter = meta.find( "description" );
         if( iter != meta.end() )
diff --git a/src/dict/bgl.cc b/src/dict/bgl.cc
index 2c358ff1..a3ad4342 100644
--- a/src/dict/bgl.cc
+++ b/src/dict/bgl.cc
@@ -391,21 +391,21 @@ namespace
       char * dictDescription = chunks.getBlock( idxHeader.descriptionAddress, chunk );
       string str( dictDescription );
       if( !str.empty() )
-        dictionaryDescription += QString( QObject::tr( "Copyright: %1%2" ) )
+        dictionaryDescription += QObject::tr( "Copyright: %1%2" )
                                  .arg( Html::unescape( QString::fromUtf8( str.data(), str.size() ) ) )
                                  .arg( "\n\n" );
       dictDescription += str.size() + 1;
 
       str = string( dictDescription );
       if( !str.empty() )
-        dictionaryDescription += QString( QObject::tr( "Author: %1%2" ) )
+        dictionaryDescription += QObject::tr( "Author: %1%2" )
                                  .arg( QString::fromUtf8( str.data(), str.size() ) )
                                  .arg( "\n\n" );
       dictDescription += str.size() + 1;
 
       str = string( dictDescription );
       if( !str.empty() )
-        dictionaryDescription += QString( QObject::tr( "E-mail: %1%2" ) )
+        dictionaryDescription += QObject::tr( "E-mail: %1%2" )
                                  .arg( QString::fromUtf8( str.data(), str.size() ) )
                                  .arg( "\n\n" );
       dictDescription += str.size() + 1;
diff --git a/src/dict/gls.cc b/src/dict/gls.cc
index eab4bf6f..d849192e 100644
--- a/src/dict/gls.cc
+++ b/src/dict/gls.cc
@@ -547,7 +547,7 @@ QString const& GlsDictionary::getDescription()
     GlsScanner scanner( getDictionaryFilenames()[ 0 ] );
     string str = Utf8::encode( scanner.getDictionaryAuthor() );
     if( !str.empty() )
-      dictionaryDescription = QString( QObject::tr( "Author: %1%2" ) )
+      dictionaryDescription = QObject::tr( "Author: %1%2" )
                               .arg( QString::fromUtf8( str.c_str() ) )
                               .arg( "\n\n" );
     str = Utf8::encode( scanner.getDictionaryDescription() );
diff --git a/src/dict/sdict.cc b/src/dict/sdict.cc
index aeaeec5b..41653357 100644
--- a/src/dict/sdict.cc
+++ b/src/dict/sdict.cc
@@ -650,7 +650,7 @@ QString const& SdictDictionary::getDescription()
   if( !dictionaryDescription.isEmpty() )
     return dictionaryDescription;
 
-  dictionaryDescription = QString( QObject::tr( "Title: %1%2" ) )
+  dictionaryDescription = QObject::tr( "Title: %1%2" )
                           .arg( QString::fromUtf8( getName().c_str() ) )
                           .arg( "\n\n" );
 
@@ -682,7 +682,7 @@ QString const& SdictDictionary::getDescription()
     else
       str = string( data.data(), size );
 
-    dictionaryDescription += QString( QObject::tr( "Copyright: %1%2" ) )
+    dictionaryDescription += QObject::tr( "Copyright: %1%2" )
                              .arg( QString::fromUtf8( str.c_str(), str.size() ) )
                              .arg( "\n\n" );
 
@@ -698,7 +698,7 @@ QString const& SdictDictionary::getDescription()
     else
       str = string( data.data(), size );
 
-    dictionaryDescription += QString( QObject::tr( "Version: %1%2" ) )
+    dictionaryDescription += QObject::tr( "Version: %1%2" )
                              .arg( QString::fromUtf8( str.c_str(), str.size() ) )
                              .arg( "\n\n" );
   }
diff --git a/src/dict/stardict.cc b/src/dict/stardict.cc
index 305f6312..f5862d54 100644
--- a/src/dict/stardict.cc
+++ b/src/dict/stardict.cc
@@ -1107,7 +1107,7 @@ QString const& StardictDictionary::getDescription()
     {
       QString copyright = QString::fromUtf8( ifo.copyright.c_str() )
                           .replace( "<br>", "\n", Qt::CaseInsensitive );
-      dictionaryDescription += QString( QObject::tr( "Copyright: %1%2" ) )
+      dictionaryDescription += QObject::tr( "Copyright: %1%2" )
                               .arg( copyright )
                               .arg( "\n\n" );
     }
@@ -1115,7 +1115,7 @@ QString const& StardictDictionary::getDescription()
     if( !ifo.author.empty() )
     {
       QString author = QString::fromUtf8( ifo.author.c_str() );
-      dictionaryDescription += QString( QObject::tr( "Author: %1%2" ) )
+      dictionaryDescription += QObject::tr( "Author: %1%2" )
                               .arg( author )
                               .arg( "\n\n" );
     }
@@ -1123,7 +1123,7 @@ QString const& StardictDictionary::getDescription()
     if( !ifo.email.empty() )
     {
       QString email = QString::fromUtf8( ifo.email.c_str() );
-      dictionaryDescription += QString( QObject::tr( "E-mail: %1%2" ) )
+      dictionaryDescription += QObject::tr( "E-mail: %1%2" )
                                .arg( email )
                                .arg( "\n\n" );
     }
@@ -1131,7 +1131,7 @@ QString const& StardictDictionary::getDescription()
     if( !ifo.website.empty() )
     {
       QString website = QString::fromUtf8( ifo.website.c_str() );
-      dictionaryDescription += QString( QObject::tr( "Website: %1%2" ) )
+      dictionaryDescription += QObject::tr( "Website: %1%2" )
                                .arg( website )
                                .arg( "\n\n" );
     }
@@ -1139,7 +1139,7 @@ QString const& StardictDictionary::getDescription()
     if( !ifo.date.empty() )
     {
       QString date = QString::fromUtf8( ifo.date.c_str() );
-      dictionaryDescription += QString( QObject::tr( "Date: %1%2" ) )
+      dictionaryDescription += QObject::tr( "Date: %1%2" )
                                .arg( date )
                                .arg( "\n\n" );
     }
diff --git a/src/ffmpegaudio.cc b/src/ffmpegaudio.cc
index 8fcdc524..d26ea1ea 100644
--- a/src/ffmpegaudio.cc
+++ b/src/ffmpegaudio.cc
@@ -154,7 +154,7 @@ bool DecoderContext::openCodec( QString & errorString )
   formatContext_ = avformat_alloc_context();
   if ( !formatContext_ )
   {
-    errorString = QObject::tr( "avformat_alloc_context() failed." );
+    errorString = "avformat_alloc_context() failed.";
     return false;
   }
 
@@ -162,7 +162,7 @@ bool DecoderContext::openCodec( QString & errorString )
 
   if ( !avioBuffer )
   {
-    errorString = QObject::tr( "av_malloc() failed." );
+    errorString = "av_malloc() failed.";
     return false;
   }
 
@@ -171,7 +171,7 @@ bool DecoderContext::openCodec( QString & errorString )
   if ( !avioContext_ )
   {
     av_free( avioBuffer );
-    errorString = QObject::tr( "avio_alloc_context() failed." );
+    errorString = "avio_alloc_context() failed.";
     return false;
   }
 
@@ -188,14 +188,14 @@ bool DecoderContext::openCodec( QString & errorString )
   ret = avformat_open_input( &formatContext_, NULL, NULL, NULL );
   if ( ret < 0 )
   {
-    errorString = QObject::tr( "avformat_open_input() failed: %1." ).arg( avErrorString( ret ) );
+    errorString = QString( "avformat_open_input() failed: %1." ).arg( avErrorString( ret ) );
     return false;
   }
 
   ret = avformat_find_stream_info( formatContext_, NULL );
   if ( ret < 0 )
   {
-    errorString = QObject::tr( "avformat_find_stream_info() failed: %1." ).arg( avErrorString( ret ) );
+    errorString = QString( "avformat_find_stream_info() failed: %1." ).arg( avErrorString( ret ) );
     return false;
   }
 
@@ -210,20 +210,20 @@ bool DecoderContext::openCodec( QString & errorString )
   }
   if ( !audioStream_ )
   {
-    errorString = QObject::tr( "Could not find audio stream." );
+    errorString = QString( "Could not find audio stream." );
     return false;
   }
 
   codec_ = avcodec_find_decoder( audioStream_->codecpar->codec_id );
   if ( !codec_ )
   {
-    errorString = QObject::tr( "Codec [id: %1] not found." ).arg( audioStream_->codecpar->codec_id );
+    errorString = QString( "Codec [id: %1] not found." ).arg( audioStream_->codecpar->codec_id );
     return false;
   }
   codecContext_ = avcodec_alloc_context3( codec_ );
   if ( !codecContext_ )
   {
-    errorString = QObject::tr( "avcodec_alloc_context3() failed." );
+    errorString = QString( "avcodec_alloc_context3() failed." );
     return false;
   }
   avcodec_parameters_to_context( codecContext_, audioStream_->codecpar );
@@ -231,7 +231,7 @@ bool DecoderContext::openCodec( QString & errorString )
   ret = avcodec_open2( codecContext_, codec_, NULL );
   if ( ret < 0 )
   {
-    errorString = QObject::tr( "avcodec_open2() failed: %1." ).arg( avErrorString( ret ) );
+    errorString = QString( "avcodec_open2() failed: %1." ).arg( avErrorString( ret ) );
     return false;
   }
 
@@ -321,7 +321,7 @@ bool DecoderContext::openOutputDevice( QString & errorString )
   #if  (QT_VERSION >= QT_VERSION_CHECK(6,2,0))
   QAudioDevice m_outputDevice = QMediaDevices::defaultAudioOutput();
   if(m_outputDevice.isNull()){
-    errorString += QObject::tr( "Can not found default audio output device" );
+    errorString += QString( "Can not found default audio output device" );
     return false;
   }
   #endif
@@ -340,7 +340,7 @@ bool DecoderContext::play( QString & errorString )
   AVFrame * frame = av_frame_alloc();
   if ( !frame )
   {
-    errorString = QObject::tr( "avcodec_alloc_frame() failed." );
+    errorString = QString( "avcodec_alloc_frame() failed." );
     return false;
   }