UI: Clarify that RGB output format is BGRA

UI/data/locale/en-US.ini

@@ -1138,7 +1138,7 @@ Basic.Settings.Advanced.Video.ColorFormat.I420="I420 (8-bit, 4:2:0, 3 planes)"
 Basic.Settings.Advanced.Video.ColorFormat.I444="I444 (8-bit, 4:4:4, 3 planes)"
 Basic.Settings.Advanced.Video.ColorFormat.P010="P010 (10-bit, 4:2:0, 2 planes)"
 Basic.Settings.Advanced.Video.ColorFormat.I010="I010 (10-bit, 4:2:0, 3 planes)"
-Basic.Settings.Advanced.Video.ColorFormat.RGB="RGB (8-bit)"
+Basic.Settings.Advanced.Video.ColorFormat.BGRA="BGRA (8-bit)"
 Basic.Settings.Advanced.Video.ColorSpace="Color Space"
 Basic.Settings.Advanced.Video.ColorSpace.sRGB="sRGB"
 Basic.Settings.Advanced.Video.ColorSpace.601="Rec. 601"

UI/frontend-plugins/decklink-output-ui/forms/output.ui

@@ -122,7 +122,7 @@
    <item>
     <widget class="QLabel" name="keyerLabel">
      <property name="text">
-      <string>Keyer output requires RGB mode in advanced settings.</string>
+      <string>Keyer output requires BGRA mode in advanced settings.</string>
      </property>
     </widget>
    </item>

UI/window-basic-settings.cpp

@@ -997,7 +997,7 @@ void OBSBasicSettings::LoadColorSpaces()
 #define CF_I444_STR QTStr("Basic.Settings.Advanced.Video.ColorFormat.I444")
 #define CF_P010_STR QTStr("Basic.Settings.Advanced.Video.ColorFormat.P010")
 #define CF_I010_STR QTStr("Basic.Settings.Advanced.Video.ColorFormat.I010")
-#define CF_RGB_STR QTStr("Basic.Settings.Advanced.Video.ColorFormat.RGB")
+#define CF_BGRA_STR QTStr("Basic.Settings.Advanced.Video.ColorFormat.BGRA")
 
 void OBSBasicSettings::LoadColorFormats()
 {
@@ -1006,7 +1006,7 @@ void OBSBasicSettings::LoadColorFormats()
 	ui->colorFormat->addItem(CF_I444_STR, "I444");
 	ui->colorFormat->addItem(CF_P010_STR, "P010");
 	ui->colorFormat->addItem(CF_I010_STR, "I010");
-	ui->colorFormat->addItem(CF_RGB_STR, "RGB");
+	ui->colorFormat->addItem(CF_BGRA_STR, "RGB"); // Avoid config break
 }
 
 #define AV_FORMAT_DEFAULT_STR \