contactsearchbar: replace label

Change-Id: Ib51a026cf5f31479d28a21f4cbc76396a44ae9b3
GitLab: #985

src/app/constant/JamiStrings.qml

@@ -35,7 +35,6 @@ Item {
     property string endCall: qsTr("End call")
     property string incomingAudioCallFrom: qsTr("Incoming audio call from {}")
     property string incomingVideoCallFrom: qsTr("Incoming video call from {}")
-    property string contactSearchConversation: qsTr("Find users and conversations")
     property string startSwarm: qsTr("Start swarm")
     property string createSwarm: qsTr("Create swarm")
     property string showInvitations: qsTr("Show invitations")

src/app/mainview/components/ContactSearchBar.qml

@@ -83,7 +83,7 @@ Rectangle {
 
         selectByMouse: true
 
-        placeholderText: JamiStrings.contactSearchConversation
+        placeholderText: JamiStrings.search
         placeholderTextColor: JamiTheme.placeholderTextColor
 
         background: Rectangle {