[Refactor] refactor function that forms human readable text out of a timeoffset

src/qt/guiutil.h

@@ -211,6 +211,8 @@ namespace GUIUtil
     /* Format a CNodeCombinedStats.nTimeOffset into a user-readable string. */
     QString formatTimeOffset(int64_t nTimeOffset);
 
+    QString formateNiceTimeOffset(qint64 secs);
+
 #if defined(Q_OS_MAC) && QT_VERSION >= 0x050000
     // workaround for Qt OSX Bug:
     // https://bugreports.qt-project.org/browse/QTBUG-15631