Add rpath to binary executable on macOS (#258)

* removing superfluous slash from paths

* Add a necessary rpath to the imhex binary

* add a little error handling to dlopen

* fall back on en-US if no language specified in prefs

* PR changes as per @WerWolv

source/window.cpp

@@ -100,8 +100,12 @@ namespace hex {
             {
                 auto language = ContentRegistry::Settings::getSetting("hex.builtin.setting.interface", "hex.builtin.setting.interface.language");
 
-                if (language.is_string())
+                if (language.is_string()) {
                     LangEntry::loadLanguage(static_cast<std::string>(language));
+                } else {
+                    // If no language is specified, fall back to English.
+                    LangEntry::loadLanguage("en-US");
+                }
             }
 
             {
@@ -787,4 +791,4 @@ namespace hex {
         ImGui::DestroyContext();
     }
 
-}
+}