thought json was not built in oops, also fixed intensity permanence

app.py

@@ -416,7 +416,7 @@ def index():
             if intensity < 0 or intensity > 100:
                 raise ValueError("Intensity must be between 0 and 100")
         except ValueError:
-            error = "Intensidad debe ser un número entre 0 y 100"
+            error = "Intensity must be a number between 0 and 100"
             intensity = 85 
         session['intensity'] = intensity
         # If print button pressed, send to driver
@@ -438,8 +438,21 @@ def index():
                         printed = True
             except Exception as e:
                 error = f"Failed to print: {e}"
-    return render_template("index.html", dithering_modes=dithering_modes, img=img_data, default_md=md,
-        printed=printed, error=error, current_dithering=session.get('dithering', 'floyd'), current_rotation=session.get('rotation', 0), current_printmode=session.get('printmode', '1bpp'), current_bannermode=session.get('bannermode', False), t=t, lang=lang)
+    return render_template(
+        "index.html",
+        dithering_modes=dithering_modes,
+        img=img_data,
+        default_md=md,
+        printed=printed,
+        error=error,
+        current_intensity=session.get('intensity', 85),
+        current_dithering=session.get('dithering', 'floyd'),
+        current_rotation=session.get('rotation', 0),
+        current_printmode=session.get('printmode', '1bpp'),
+        current_bannermode=session.get('bannermode', False),
+        t=t,
+        lang=lang
+    )
 
 @app.route('/manifest.json')
 def manifest():

requirements.txt

@@ -2,4 +2,3 @@ Flask
 markdown
 Pillow
 requests
-json

templates/index.html

@@ -560,7 +560,7 @@
           </div>
           <div class="options-intensity">
             <label for="intensity">{{ t['intensity'] }}</label>
-            <input type="number" name="intensity" value="85" min="0" max="100" step="1">
+            <input type="number" name="intensity" value="{{ current_intensity }}" min="0" max="100" step="1">
           </div>
           <div class="options-rotation">
             <label for="rotation">{{ t['rotate_image'] }}</label>