On Fedora 29.1-2, when running `bitcoin-qt -regtest`, the name of the application in the menu bar is shown as `Bitcoin-Qt-testnet` (the icon is the correct blue colour). i.e:
![fedora - notifications](https://user-images.githubusercontent.com/863730/50596726-23f17280-0ee0-11e9-9083-31c8baf62feb.png)


Noticed while testing #15000 (confirmed unrelated by testing master). When running just `bitcoin-qt`, or passing `-testnet` the menu name and icon are both correct.
#ifndef BITCOIN_QT_GUICONSTANTS_H
#define BITCOIN_QT_GUICONSTANTS_H
static const int MODEL_UPDATE_DELAY = 250;
static const int MAX_PASSPHRASE_SIZE = 1024;
static const int STATUSBAR_ICONSIZE = 16;
static const bool DEFAULT_SPLASHSCREEN = true;
#define STYLE_INVALID "background:#FF8080"
#define COLOR_UNCONFIRMED QColor(128, 128, 128)
#define COLOR_NEGATIVE QColor(255, 0, 0)
#define COLOR_BAREADDRESS QColor(140, 140, 140)
#define COLOR_TX_STATUS_OPENUNTILDATE QColor(64, 64, 255)
#define COLOR_TX_STATUS_DANGER QColor(200, 100, 100)
#define COLOR_BLACK QColor(0, 0, 0)
/* Tooltips longer than this (in characters) are converted into rich text,
   so that they can be word-wrapped.
 */
static const int TOOLTIP_WRAP_THRESHOLD = 80;
static const int MAX_URI_LENGTH = 255;
#define QR_IMAGE_SIZE 300
#define SPINNER_FRAMES 36
#define QAPP_ORG_NAME "Bitcoin"
#define QAPP_ORG_DOMAIN "bitcoin.org"
#define QAPP_APP_NAME_DEFAULT "Bitcoin-Qt"
#define QAPP_APP_NAME_TESTNET "Bitcoin-Qt-testnet"
#endif