refactor: Reduce number of SanityChecks return values

src/kernel/checks.cpp

@@ -7,21 +7,22 @@
 #include <key.h>
 #include <random.h>
 #include <util/time.h>
+#include <util/translation.h>
 
 namespace kernel {
 
-std::optional<SanityCheckError> SanityChecks(const Context&)
+std::optional<bilingual_str> SanityChecks(const Context&)
 {
     if (!ECC_InitSanityCheck()) {
-        return SanityCheckError::ERROR_ECC;
+        return Untranslated("Elliptic curve cryptography sanity check failure. Aborting.");
     }
 
     if (!Random_SanityCheck()) {
-        return SanityCheckError::ERROR_RANDOM;
+        return Untranslated("OS cryptographic RNG sanity check failure. Aborting.");
     }
 
     if (!ChronoSanityCheck()) {
-        return SanityCheckError::ERROR_CHRONO;
+        return Untranslated("Clock epoch mismatch. Aborting.");
     }
 
     return std::nullopt;

src/kernel/checks.h

@@ -7,20 +7,16 @@
 
 #include <optional>
 
+struct bilingual_str;
+
 namespace kernel {
 
 struct Context;
 
-enum class SanityCheckError {
-    ERROR_ECC,
-    ERROR_RANDOM,
-    ERROR_CHRONO,
-};
-
 /**
  *  Ensure a usable environment with all necessary library support.
  */
-std::optional<SanityCheckError> SanityChecks(const Context&);
+std::optional<bilingual_str> SanityChecks(const Context&);
 
 }