British to American spelling (#1837)

* British to American spelling

README.md

@@ -12,7 +12,7 @@ Though arguably less convenient to edit than a wiki, this git repository is mean
 
 ### Editing existing pages
 
-To edit an existing page, locate its .rst source file and open it in your favourite text editor. You can then commit the changes, push them to your fork and make a pull request. **Note that the pages in `classes/` should not be edited here, they are automatically generated from Godot's [XML class references](https://github.com/godotengine/godot/tree/master/doc/classes).**
+To edit an existing page, locate its .rst source file and open it in your favorite text editor. You can then commit the changes, push them to your fork and make a pull request. **Note that the pages in `classes/` should not be edited here, they are automatically generated from Godot's [XML class references](https://github.com/godotengine/godot/tree/master/doc/classes).**
 
 ### Adding new pages
 
@@ -40,7 +40,7 @@ Similarly, you can include attachments (like assets as support material for a tu
 
 ## Building with Sphinx
 
-To build the HTML website (or any other format supported by Sphinx, like PDF, EPUB or LaTeX), you need to install [Sphinx](http://sphinx-doc.org/) >= 1.3 as well as (for the HTML) the [readthedocs.org theme](https://github.com/snide/sphinx_rtd_theme). Only the Python 3 flavour was tested, though the Python 2 versions might work too.
+To build the HTML website (or any other format supported by Sphinx, like PDF, EPUB or LaTeX), you need to install [Sphinx](http://sphinx-doc.org/) >= 1.3 as well as (for the HTML) the [readthedocs.org theme](https://github.com/snide/sphinx_rtd_theme). Only the Python 3 flavor was tested, though the Python 2 versions might work too.
 
 Those tools are best installed using [pip](https://pip.pypa.io), Python's module installer. The Python 3 version might be provided (on Linux distros) as `pip3` or `python3-pip`. You can then run:
 
@@ -62,7 +62,7 @@ make SPHINXBUILD=~/.local/bin/sphinx-build html
 ```
 
 The compilation might take some time as the `classes/` folder contains many files to parse.  
-You can then test the changes live by opening `_build/html/index.html` in your favourite browser.
+You can then test the changes live by opening `_build/html/index.html` in your favorite browser.
 
 ### Building with Sphinx on Windows
 

getting_started/step_by_step/ui_introduction_to_the_ui_system.rst

@@ -38,7 +38,7 @@ All control nodes share the same main properties:
 
 1. Anchor
 2. Bounding rectangle
-3. Focus and focus neighbour
+3. Focus and focus neighbor
 4. Size flags
 5. Margin
 6. The optional UI theme
@@ -73,7 +73,7 @@ TextureRect
 
 **TextureRect** displays a texture or image inside a UI.
 It seems similar to the Sprite node but it offers multiple scaling modes.
-Set the Stretch Mode property to change its behaviour:
+Set the Stretch Mode property to change its behavior:
 
 - ``Scale On Expand (compat)`` scales the texture to fit the node’s bounding rectangle, only if ``expand`` property is ``true``; otherwise, it behaves like ``Keep`` mode. Default mode for backwards compatibility.
 - ``Scale`` scales the texture to fit the node’s bounding rectangle
@@ -84,7 +84,7 @@ Set the Stretch Mode property to change its behaviour:
 - ``Keep Aspect`` and ``Keep Aspect Centered`` scales the texture but force it to remain its original aspect ratio, in the top left corner or the center of the frame respectively
 - ``Keep Aspect Covered`` works just like ``Keep Aspect Centered`` but the shorter side fits the bounding rectangle and the other one clips to the node’s limits
 
-As with Sprite nodes, you can modulate the TextureRect's colour. Click
+As with Sprite nodes, you can modulate the TextureRect's color. Click
 the ``Modulate`` property and use the color picker.
 
 .. figure:: img/five_common_nodes_textureframe.png
@@ -156,7 +156,7 @@ NinePatchRect
 
 **NinePatchRect** takes a texture split in 3 rows and 3 columns. The
 center and the sides tile when you scale the texture, but it never
-scales the corners. It is useful to build panels, dialogue boxes
+scales the corners. It is useful to build panels, dialog boxes
 and scalable backgrounds for your UI.
 
 .. figure:: img/five_common_nodes_ninepatchrect.png