Clean up a few GUI related items (#2846)

* Remove unused (old) icons

* Remove red line from top/bottom of frame

* Remove red line from about image

* Clean up theme display names

* Remove DASH at the beginning (just redundant)
* Capitalize theme names

* Flip "about" image back on its end

* Fix up about image a bit

src/qt/optionsdialog.cpp

@@ -92,13 +92,13 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     }
     
     /* Theme selector */
-    ui->theme->addItem(QString("DASH-light"), QVariant("light"));
+    ui->theme->addItem(QString("Light"), QVariant("light"));
-    ui->theme->addItem(QString("DASH-light-hires"), QVariant("light-hires"));
+    ui->theme->addItem(QString("Light-HiRes"), QVariant("light-hires"));
-    ui->theme->addItem(QString("DASH-light-retro"), QVariant("light-retro"));
+    ui->theme->addItem(QString("Light-Retro"), QVariant("light-retro"));
-    ui->theme->addItem(QString("DASH-light-hires-retro"), QVariant("light-hires-retro"));
+    ui->theme->addItem(QString("Light-HiRes-Retro"), QVariant("light-hires-retro"));
-    ui->theme->addItem(QString("DASH-blue"), QVariant("drkblue"));
+    ui->theme->addItem(QString("Blue"), QVariant("drkblue"));
-    ui->theme->addItem(QString("DASH-Crownium"), QVariant("crownium"));
+    ui->theme->addItem(QString("Crownium"), QVariant("crownium"));
-    ui->theme->addItem(QString("DASH-traditional"), QVariant("trad"));
+    ui->theme->addItem(QString("Traditional"), QVariant("trad"));
 
     /* Language selector */
     QDir translations(":translations");