Change all words with the suffix -isation to the American spelling

content/darkroom/organization/module-groups.md

@@ -60,7 +60,7 @@ This preset provides a minimal set of modules targeted as a starting point for b
 
 # _previous config_
 
-These presets are automatically generated for users who have upgraded from a version of darktable prior to 3.4. Where you have previously set up favourites or altered the _hidden_ flag on modules, these presets contains those customisations, retaining the legacy module groups (_previous config_ preset) or new module groups (_previous config with new layout_ preset).
+These presets are automatically generated for users who have upgraded from a version of darktable prior to 3.4. Where you have previously set up favourites or altered the _hidden_ flag on modules, these presets contains those customizations, retaining the legacy module groups (_previous config_ preset) or new module groups (_previous config with new layout_ preset).
 
 If favourites were created in prior versions these will remain available in an additional group:
 

content/darkroom/processing-modules/wavelets.md

@@ -25,7 +25,7 @@ The following is an example where detail layers have been extracted from the abo
 
 ![wavelets-retouch-gui](./wavelets/clean-retouch.png#w33)
 
-The bars in the _wavelet decompose_ section indicate the layers that have been extracted at different wavelet scales. The darkest rectangle at the left represents the entire image (before decomposition) and the gray boxes each represent one of the decomposed layers. Clicking on the staircase icon below the bar graph enables the layer visualisation overlay so that you can see what the currently selected layer looks like. 
+The bars in the _wavelet decompose_ section indicate the layers that have been extracted at different wavelet scales. The darkest rectangle at the left represents the entire image (before decomposition) and the gray boxes each represent one of the decomposed layers. Clicking on the staircase icon below the bar graph enables the layer visualization overlay so that you can see what the currently selected layer looks like. 
 
 Let's take a look at some of the layers generated for the above image.
 

content/module-reference/processing-modules/tone-equalizer.md

@@ -89,8 +89,8 @@ edges refinement/feathering
 mask post-processing
 : This bar provides a representation of the current span of the mask's histogram. It covers the middle 80% of the histogram, dropping the first and last decile to prevent outliers from skewing the indicator too much. Orange indicators at either end mean that the histogram exceeds the upper or lower bounds of its 9 EV range.
 
-mask quantisation
-: Apply a degree of posterisation to the mask, so that it tends to centre round a few discrete levels. In some cases, this may be useful to help separate out areas of your image into distinct masking levels.
+mask quantization
+: Apply a degree of posterization to the mask, so that it tends to centre round a few discrete levels. In some cases, this may be useful to help separate out areas of your image into distinct masking levels.
 
 mask exposure compensation
 : Adjust the mask's histogram to the left or right. If you have used the _exposure_ module to adjust the image brightness, you may need to offset that adjustment by using this slider to re-centre the mask's histogram. Click on the wand icon to the right of the slider to set the exposure compensation such that the average of the mask's histogram will coincide with the central --4EV control point. The slider can then be fine-tuned as required.

content/preferences-settings/general.md

@@ -24,7 +24,7 @@ GUI controls and text DPI
 
 # CSS theme modifications
 
-In addition to selecting a pre-built theme you can also apply additional CSS customisations of your own to tweak the look-and-feel of darktable.
+In addition to selecting a pre-built theme you can also apply additional CSS customizations of your own to tweak the look-and-feel of darktable.
 
 Two different methods are provided for this:
 
@@ -50,7 +50,7 @@ create theme tweaks
 
 All of darktable's pre-built themes are provided as CSS files in `$DARKTABLE/share/darktable/themes/` (where `$DARKTABLE` is darktable's installation directory). The `darktable.css` theme contains the bulk of the code used to control the look-and-feel of darktable. A number of other themes are also provided but most of them use `darktable.css` as a base (by importing `darktable.css` using the `@import url` directive).
 
-If you choose to create your own custom theme file you are advised to follow a similar approach -- import one of darktable's existing theme files using `@import url` (this directive expects relative paths) and then apply your own customisations on top. You do not need to do this when using the CSS text box in the preferences dialog -- attempting to use `@import url` in the CSS tweaks text box will not work correctly.
+If you choose to create your own custom theme file you are advised to follow a similar approach -- import one of darktable's existing theme files using `@import url` (this directive expects relative paths) and then apply your own customizations on top. You do not need to do this when using the CSS text box in the preferences dialog -- attempting to use `@import url` in the CSS tweaks text box will not work correctly.
 
 Themes use the same basic CSS principles as in html browsers (with some minor exceptions -- see the [Gtk documentation](https://developer-old.gnome.org/gtk3/stable/chap-css-overview.html) for details):
 

content/preferences-settings/miscellaneous.md

@@ -60,7 +60,7 @@ prefer unmasked instances
 selection order
 : After applying the above rules, apply the shortcut to the first or last instance remaining (default "last instance").
 
-# map / geolocalisation view
+# map / geolocalization view
 
 pretty print the image location
 : Show a more readable representation of the geo-location in the [image information](../module-reference/utility-modules/shared/image-information.md) module (default on).