Fix up file filters for filename fields of device configs for consistency

- Filter descriptions are now translatable
- Extensions get uppercase and lowercase variations on *nix
- Add "All files" option

src/qt/qt_util.cpp

@@ -92,6 +92,29 @@ DlgFilter(std::initializer_list<QString> extensions, bool last)
     return " (" % temp.join(' ') % ")" % (!last ? ";;" : "");
 }
 
+QString
+DlgFilter(QStringList extensions, bool last)
+{
+    QStringList temp;
+
+    for (auto ext : extensions) {
+#ifdef Q_OS_UNIX
+        if (ext == "*") {
+            temp.append("*");
+            continue;
+        }
+        temp.append("*." % ext.toUpper());
+#endif
+        temp.append("*." % ext);
+    }
+
+#ifdef Q_OS_UNIX
+    temp.removeDuplicates();
+#endif
+    return " (" % temp.join(' ') % ")" % (!last ? ";;" : "");
+}
+
+
 QString currentUuid()
 {
     auto configPath = QFileInfo(cfg_path).dir().canonicalPath();