Back/FW UI buttons tooltips: shorter & consistency

src/gui/MainPane/TopBar.qml

@@ -148,7 +148,7 @@ Rectangle {
             visible: Layout.preferredWidth > 0
             backgroundColor: "transparent"
             icon.name: "go-back-to-chat-from-main-pane"
-            toolTip.text: qsTr("Go back to room")
+            toolTip.text: qsTr("Go to chat")
 
             onClicked: mainPane.toggleFocus()
 

src/gui/Pages/Chat/RoomHeader.qml

@@ -30,7 +30,7 @@ Rectangle {
             padded: false
             backgroundColor: "transparent"
             icon.name: "go-back-to-main-pane"
-            toolTip.text: qsTr("Go back to main pane")
+            toolTip.text: qsTr("Back to main pane")
             onClicked: mainUI.mainPane.toggleFocus()
 
             Layout.preferredWidth: show ? avatar.width : 0

src/gui/Pages/Chat/RoomPane/RoomPane.qml

@@ -64,7 +64,7 @@ MultiviewPane {
 
         toolTip.text:
             modelData === "back" ?
-            qsTr("Go back to chat") :
+            qsTr("Back to chat") :
             qsTr(modelData.charAt(0).toUpperCase() + modelData.slice(1))
 
         autoExclusive: true