fix (Qt) issues found by clang's clazy tool:

+ -Wclazy-incorrect-emit
+ -Wclazy-strict-iterators
+ -Wclazy-overloaded-signal
+ -Wclazy-qstring-arg
+ -Wclazy-unused-non-trivial-variable
+ -Wclazy-container-anti-pattern
+ -Wclazy-range-loop-reference
+ -Wclazy-const-signal-or-slot
+ -Wclazy-detaching-temporary
+ -Wclazy-qfileinfo-exists

src/Gui/Language/Translator.cpp

@@ -200,7 +200,7 @@ TStringList Translator::supportedLanguages() const
 {
     TStringList languages;
     TStringMap locales = supportedLocales();
-    for (auto it : locales)
+    for (const auto& it : locales)
         languages.push_back(it.first);
 
     return languages;