Merge pull request qmlbook#77 from qmlbook/ch05-fluid-elements

fluid-elements.md: fix language issues

docs/ch05-fluid/fluid-elements.md

@@ -1,10 +1,10 @@
 # Fluid Elements
 
-Till now, we have mostly looked at some simple graphical elements and how to arrange and manipulate them. 
+Until now, we have mostly looked at some simple graphical elements and how to arrange and manipulate them. 
 
-This chapter is about how to control these changes in a way that a value of a property not just changes instantly, it’s more how the value changes over time: an animation. 
+This chapter is about how to make these changes more interesting by animating them. 
 
-Animations are one of the key foundations for modern slick user interfaces and can be described for your user interface using states, transitions and animations. Each state defines a set of property changes and can be combined with animations on state changes. These changes are described as a transition from one state to another state.
+Animations are one of the key foundations for modern, slick user interfaces, and can be employed in your user interface via states, transitions and animations. Each state defines a set of property changes and can be combined with animations on state changes. These changes are described as a transition from one state to another state.
 
-Besides animations are used during transitions they also can be used as standalone elements triggered by some scripted events.
+Besides animations being used during transitions, they can also be used as standalone elements triggered by some scripted events.