Text cleanup

This MR goes over text and cleans it up to be more unifying. Mostly just lowercasing words in non-titles, but it also changes the "show fancy effects" text to be clearer with its meaning.  
It also fixes the room access being printed in the room settings:  ![image](/uploads/864606de81f0f603ebb85dbe7c745491/image.png)  
I'd like to do a second pass later with another MR to unify triple dots (...) and ellipsis (…)

src/qml/Dialog/CreateRoomDialog.qml

@@ -18,13 +18,13 @@ Kirigami.OverlaySheet {
     contentItem: Kirigami.FormLayout {
         QQC2.TextField {
             id: roomNameField
-            Kirigami.FormData.label: i18n("Room Name")
+            Kirigami.FormData.label: i18n("Room name:")
             onAccepted: roomTopicField.forceActiveFocus();
         }
 
         QQC2.TextField {
             id: roomTopicField
-            Kirigami.FormData.label: i18n("Room Topic")
+            Kirigami.FormData.label: i18n("Room topic:")
             onAccepted: okButton.forceActiveFocus();
         }
 

src/qml/Panel/RoomDrawer.qml

@@ -259,7 +259,7 @@ Kirigami.OverlayDrawer {
 
                 QQC2.Label {
                     Layout.alignment: Qt.AlignRight
-                    text: room ? i18np("%1 Member", "%1 Members", room.joinedCount) : i18n("No Member Count")
+                    text: room ? i18np("%1 member", "%1 members", room.joinedCount) : i18n("No member count")
                 }
             }