- Mediawiki 1.31.1.
- tested with current FireFox 64.0/64-bit.
- In LocalSettings.php set
```
$wgShellLocale = "de_DE.utf8";
$wgResponsiveImages = true;
```
- Upload an image, e.g. 'Osmbanner2.png'.
- In a page (editing) insert
`[[File:Osmbanner2.png|none|middle|frame]]`
AND
`[[File:Osmbanner2.png|none|middle|thumb]]`
- Save the page.
- Result: First image is displayed.
Second one not. One see only the ALT-Text.
- Reason: Output of the image contains a
n invalid comma (`1,5x`) instead of a dot (`1.5x`) in `srcset` part
```
<div class="thumb tnone">
<div class="thumbinner" style="width:302px;">
<a href="/index.php?title=Datei:Osmbanner2.png" class="image">
<img alt="Osmbanner2.png" src="/images/thumb/9/92/Osmbanner2.png/300px-Osmbanner2.png" class="thumbimage"
srcset="/images/thumb/9/92/Osmbanner2.png/450px-Osmbanner2.png 1,5x
... and so on ...
```
- In file `includes/Html.php` line 1044:
```
$density = (string)(float)$density;
```
The float function is processed with german `locale`.