Prepare for brazilian portuguese translation, updated translators

.tx/config

...hku/quasseldroid/ui/clientsettings/about/AboutFragment.kt

...schku/quasseldroid/util/missingfeatures/MissingFeature.kt

...asseldroid/util/missingfeatures/MissingFeaturesAdapter.kt

...uasseldroid/util/missingfeatures/MissingFeaturesDialog.kt

app/src/main/res/values-pt-rBR/strings.xml

app/src/main/res/values-pt-rBR/strings_contributors.xml

app/src/main/res/values-pt-rBR/strings_defaults.xml

app/src/main/res/values-pt-rBR/strings_error.xml

app/src/main/res/values-pt-rBR/strings_format.xml

app/src/main/res/values-pt-rBR/strings_info.xml

app/src/main/res/values-pt-rBR/strings_messages.xml

app/src/main/res/values-pt-rBR/strings_preferences.xml

app/src/main/res/values-pt-rBR/strings_settings.xml

app/src/main/res/values-pt-rBR/strings_setup.xml

app/src/main/res/values-pt-rBR/strings_status.xml

app/src/main/res/values/strings_preferences.xml