Duplicated strings - BLOCKED UNTIL THE 2 APPS HAVE SAME FLOW

There is an issue on Strings between iOS and Android application.

On Android, some strings have been added for submit buttons, like for instance:

https://github.com/vector-im/element-x-android/blob/develop/features/login/impl/src/main/res/values/localazy.xml#L40
```xml
"Continue"
```

instead of using the generic string
https://github.com/vector-im/element-x-android/blob/develop/libraries/ui-strings/src/main/res/values/localazy.xml#L19
```xml
"Continue"
```

The value is the same in English, but translations can differ (maybe not for this particular example though), which is not what we want.

We should simplify by removing the extra string entries, and use the generic value when it exists. It will reduce the number of strings to translate and will ensure that Android and iOS are synced. The drawback is that it will not be possible to tweak a value for a particular string by just updating Localazy.

We can use the find duplicate facilities on Localazy to detect identical strings, and probably remove all the duplicates.