Initialize translation dictionary to default

Initializes the dictionary before potential messages are shown on the
screen.

Fixes https://gitlab.com/kicad/code/kicad/issues/7076

common/pgm_base.cpp

@@ -236,12 +236,6 @@ bool PGM_BASE::InitPgm()
             return false;
     }
 
-    m_settings_manager = std::make_unique<SETTINGS_MANAGER>();
-
-    // Something got in the way of settings load: can't continue
-    if( !m_settings_manager->IsOK() )
-        return false;
-
     // Init KiCad environment
     // the environment variable KICAD (if exists) gives the kicad path:
     // something like set KICAD=d:\kicad
@@ -272,9 +266,16 @@ bool PGM_BASE::InitPgm()
     wxFileSystem::AddHandler( new wxZipFSHandler );
 
     // Analyze the command line & initialize the binary path
+    wxString tmp;
     setExecutablePath();
-
     SetLanguagePath();
+    SetDefaultLanguage( tmp );
+
+    m_settings_manager = std::make_unique<SETTINGS_MANAGER>();
+
+    // Something got in the way of settings load: can't continue
+    if( !m_settings_manager->IsOK() )
+        return false;
 
     wxFileName baseSharePath;
 #if defined( __WXMSW__ )
@@ -438,7 +439,6 @@ bool PGM_BASE::InitPgm()
     // Init user language *before* calling loadCommonSettings, because
     // env vars could be incorrectly initialized on Linux
     // (if the value contains some non ASCII7 chars, the env var is not initialized)
-    wxString tmp;
     SetLanguage( tmp, true );
 
     loadCommonSettings();
@@ -681,6 +681,44 @@ bool PGM_BASE::SetLanguage( wxString& aErrMsg, bool first_time )
 }
 
 
+bool PGM_BASE::SetDefaultLanguage( wxString& aErrMsg )
+{
+    setLanguageId( wxLANGUAGE_DEFAULT );
+
+    // dictionary file name without extend (full name is kicad.mo)
+    wxString dictionaryName( "kicad" );
+
+    delete m_locale;
+    m_locale = new wxLocale;
+    m_locale->Init();
+
+    // Try adding the dictionary if it is not currently loaded
+    if( !m_locale->IsLoaded( dictionaryName ) )
+        m_locale->AddCatalog( dictionaryName );
+
+    // Verify the Kicad dictionary was loaded properly
+    // However, for the English language, the dictionary is not mandatory, as
+    // all messages are already in English, just restricted to ASCII7 chars,
+    // the verification is skipped.
+    if( !m_locale->IsLoaded( dictionaryName ) && m_language_id != wxLANGUAGE_ENGLISH )
+    {
+        wxLogTrace( traceLocale, "Unable to load dictionary %s.mo in %s",
+                    dictionaryName, m_locale->GetName() );
+
+        setLanguageId( wxLANGUAGE_DEFAULT );
+        delete m_locale;
+
+        m_locale = new wxLocale;
+        m_locale->Init();
+
+        aErrMsg = _( "The KiCad language file for this language is not installed." );
+        return false;
+    }
+
+    return true;
+}
+
+
 void PGM_BASE::SetLanguageIdentifier( int menu_id )
 {
     wxLogTrace( traceLocale, "Select language ID %d from %d possible languages.",

include/pgm_base.h

@@ -230,6 +230,14 @@ public:
      */
     virtual bool SetLanguage( wxString& aErrMsg, bool first_time = false );
 
+    /**
+     * Set the default language without reference to any preferences.  Can be used to set
+     * the language for dialogs that show before preferences are loaded
+     * @param aErrMsg String to return the error messsage(s) in
+     * @return false if the language could not be set
+     */
+    bool SetDefaultLanguage( wxString& aErrMsg );
+
     /**
      * Set in .m_language_id member the wxWidgets language identifier ID fromthe KiCad
      * menu id (internal menu identifier).