GUI::show_error() is now generalized for std::string and const char*

Fixed return type of std::string translate_utf8() with context
(incorrectly returned wxString, should return std::string).
Fixed double translation of BackgroundSlicingProcess::validate() in Plater.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 9e003aac5..14f24a999 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3074,10 +3074,10 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
             auto *top_level_wnd = dynamic_cast<wxTopLevelWindow*>(p);
             if (! postpone_error_messages && top_level_wnd && top_level_wnd->IsActive()) {
                 // The error returned from the Print needs to be translated into the local language.
-                GUI::show_error(this->q, _(err));
+                GUI::show_error(this->q, err);
             } else {
                 // Show the error message once the main window gets activated.
-                this->delayed_error_message = _(err).ToUTF8();
+                this->delayed_error_message = err;
             }
             return_state |= UPDATE_BACKGROUND_PROCESS_INVALID;
         }