bug(web): `addKeyboardsForLanguage`: can't add German

The name for German used in the languages table is "German, Standard". However, trying to add that through a call to `addKeyboardsForLanguage` doesn't work because the parameters get split by comma and there is no exact match for "German".

This can be observed by two errors on the console:
```
keyman.addKeyboardsForLanguage failed with No keyboards are available for german. Does it have another language name?:
addLanguageKeyboards/<@http://127.0.0.1:3001/build/publish/debug/keymanweb.js:7056:63
...
No keyboards are available for standard. Does it have another language name?:
addLanguageKeyboards/<@http://127.0.0.1:3001/build/publish/debug/keymanweb.js:7056:63
...
for "German, Standard"
```