[i18n] fix build on macos

Signed-off-by: R4SAS <r4sas@i2pmail.org>

i18n/I18N.h

@@ -94,10 +94,10 @@ std::string tr (TValue&& arg, TArgs&&... args)
 {
 	std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg));
 
-	size_t size = snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
+	size_t size = std::snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
 	size = size + 1;
 	std::string str(size, 0);
-	snprintf(str.data(), size, tr_str.c_str(), std::forward<TArgs>(args)...);
+	std::snprintf(str.data(), size, tr_str.c_str(), std::forward<TArgs>(args)...);
 
 	return str;
 }
@@ -126,10 +126,10 @@ std::string ntr (TValue&& arg, TValue2&& arg2, int& n, TArgs&&... args)
 {
 	std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg), std::forward<TValue2>(arg2), std::forward<int>(n));
 
-	size_t size = snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
+	size_t size = std::snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
 	size = size + 1;
 	std::string str(size, 0);
-	snprintf(str.data(), size, tr_str.c_str(), std::forward<TArgs>(args)...);
+	std::snprintf(str.data(), size, tr_str.c_str(), std::forward<TArgs>(args)...);
 
 	return str;
 }