title: Special letters in hovering data in map plots (Plotly Express)
body: <p>I've used Plotly Express for categorizing different zones in Denmark. Is there a way to include special letters (in my case: 'æ', 'ø', 'å')? When hovering over the cities of my map of Denmark, these letters are just displayed as a square with a question mark.</p>
  <p><img src="https://i.stack.imgur.com/CmvB6.png" alt="Example picture" /></p>
  <pre><code>import plotly.express as px
  import json
  import pandas as pd
  
  # Load data
  with open(&quot;map1.geojson&quot;) as f:
      geo_data = json.load(f)
  
  df = pd.read_csv(&quot;postnr12.csv&quot;,
                     dtype={&quot;fips&quot;: str})
  
  fig = px.choropleth_mapbox(df,
                      locations=df[&quot;Postnummer&quot;],
                      geojson = geo_data,
                      color = df[&quot;Zone&quot;],
                      featureidkey = &quot;properties.POSTNR_TXT&quot;,
                      hover_name = 'Postnummer', #info ved de forskellige lokationer
                      hover_data = (['by']), #showscale = False, text = df[&quot;by&quot;], name = ' ',
                      mapbox_style=&quot;stamen-terrain&quot;,
                      center = {&quot;lat&quot;: 56.26392, &quot;lon&quot;: 9.501785},
                      zoom=5.5, opacity=0.4,)
  #fig.update_geos(fitbounds=&quot;locations&quot;, visible=False)
  fig.update_layout(coloraxis_showscale=False)
  </code></pre>
  <p>[![CSV][2]][2]</p>