Simple string in sitemap shows error

Add-ons Bindings
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1

weather.items:
String OutTempValue { http="<[https://raspberrypi/zamg.php:1200000]" }

default.sitemap:
Text item=OutTempValue label=“Temperatur in Grad Celsius: [%]” icon=“temperature”

Website gets only the value back. example: " 1.1 ";

I want to get in default.item:

1.1 Grad Celsius
at the moment it shows “Err”

2 
Text item=OutTempValue label=“Temperatur in Grad Celsius: [%]” icon=“temperature”

Probably should be:

Text item=OutTempValue label="Temperatur in Grad Celsius: [%.1f]" icon="temperature"
3

Now it shows only -
‰. 1f declares float. I think I need simple String!

4

Below an example that is working for me. As you see, I have the “[%.1f °C]” already in my .items file:

.items:

Number KNX_GV_Keuken_Temp1_8_0_1  "Temperatuur Keuken 1 [%.1f °C]" 	<temperature>  { knx="<8/0/1" }

.sitemap:

Text item=KNX_GV_Keuken_Temp1_8_0_1  label="Temperatuur keuken [%.1f °C]"