missingFiles: Create newFile with all new tags

Might be a good functionality to instead of generating multiple missingTags files, creating one main missingTags file with the names of missing tags, like bellow:

```
<--MissingTags in names.xml-->
<personal.Name>
<Surname>

<--MissingTags in background.xml-->
<floor></floor>
<water>(maybe with english content?)</water>

(...)
```