[UX] tab2_constraints.py: British spelling (optimization -> optimisation)

tabs/tab2_constraints.py

@@ -548,7 +548,7 @@ def render_tab(cost_sliders):
         """
         <div class="text_with_border">
             <p>
-            This section lets you <strong>control which CDR methods are included or excluded from the optimization</strong> according to the specific context of the studied country.<br>
+            This section lets you <strong>control which CDR methods are included or excluded from the optimisation</strong> according to the specific context of the studied country.<br>
             For example, you can switch off marine CDR methods for those country with no access to the seas. Some countries may also have legal or tacit bans on specific CDR methods.<br><br>
             For the included methods, you can also set a <strong>maximum deployment cap</strong> per method, by <strong>% of its total potential</strong> or by an <strong>absolute value</strong> in {CO2_UNIT}/yr. Use this parameter in situations where the resources are largely available in the country but other parameters will hinder the deployment, for example low maturity CDR methods, slow deployment of CO2 transport infrastructure, documented low adoption rates...
             </p>