Add codespell: configuration, workflow (to alert on new added) and some typos fixed

.codespellrc

@@ -0,0 +1,4 @@
+[codespell]
+skip = .git,*.pdf,*.svg,*.min.js,yarn.lock,vendor_modules
+#
+# ignore-words-list =

.github/workflows/codespell.yml

@@ -0,0 +1,22 @@
+---
+name: Codespell
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

client/config/webpack.config.js

@@ -170,7 +170,7 @@ webpackConfig.module.loaders.push({
 // css-loader not to duplicate minimization.
 const BASE_CSS_LOADER = 'css?sourceMap&-minimize';
 
-// Add any packge names here whose styles need to be treated as CSS modules.
+// Add any package names here whose styles need to be treated as CSS modules.
 // These paths will be combined into a single regex.
 const PATHS_TO_TREAT_AS_CSS_MODULES = [
   // 'react-toolbox', (example)

client/src/components/EditColumnModal.js

@@ -82,7 +82,7 @@ export default class EditColumnModal extends React.Component {
               ref={c => this._editableGrid = c}
             />
           </div>
-          {/* A div below fixes Handsontable issue with Copy & Paste in a Boostrap modal dialog */}
+          {/* A div below fixes Handsontable issue with Copy & Paste in a Bootstrap modal dialog */}
           <div id="CopyPasteDiv" style={{position: 'fixed', top: -10000, left: -10000}}>
             <textarea
               className="copyPaste"

client/src/store/createStore.js

@@ -14,7 +14,7 @@ export default (initialState = {}, history) => {
   // ======================================================
   const enhancers = [];
   if (__DEBUG__) {
-    // Disbale devtools
+    // Disable devtools
     // const devToolsExtension = window.devToolsExtension;
     // if (typeof devToolsExtension === 'function') {
     //   enhancers.push(devToolsExtension());

server/nlweb/tasks.py

@@ -5,7 +5,7 @@
 import tempfile
 
 import matplotlib
-# Force matplotlib to not use an Xwindows backend.
+# Force matplotlib to not use an X backend.
 # Otherwise you'll get this error:
 # _tkinter.TclError: no display name and no $DISPLAY environment variable
 matplotlib.use('Agg')

server/nlweb/views/api.py

@@ -246,7 +246,7 @@ def create_test():
 
     model_id = data.get('modelId')
     if model_id:
-        # Check existance
+        # Check existence
         MLModel.query.get_or_404(int(model_id))
 
     model_test = ModelTest(state=ModelTest.STATE_QUEUED,