Update all translations; remove unused resources; version 1.6.2

MediaPhone/build.gradle

.../ac/robinson/mediaphone/activity/PreferencesActivity.java

...robinson/mediaphone/activity/TemplateBrowserActivity.java

...a/ac/robinson/mediaphone/importing/BluetoothObserver.java

.../main/java/ac/robinson/mediaphone/provider/MediaItem.java

.../java/ac/robinson/mediaphone/provider/UpgradeManager.java

MediaPhone/src/main/res/layout/narratives_empty.xml

MediaPhone/src/main/res/layout/templates_empty.xml

MediaPhone/src/main/res/values-es/arrays.xml

MediaPhone/src/main/res/values-es/store_listing.xml

MediaPhone/src/main/res/values-es/strings.xml

MediaPhone/src/main/res/values-fr/arrays.xml

MediaPhone/src/main/res/values-fr/store_listing.xml

MediaPhone/src/main/res/values-fr/strings.xml

MediaPhone/src/main/res/values-nl/arrays.xml

MediaPhone/src/main/res/values-nl/store_listing.xml

MediaPhone/src/main/res/values-nl/strings.xml

MediaPhone/src/main/res/values-pl/arrays.xml

MediaPhone/src/main/res/values-pl/store_listing.xml

MediaPhone/src/main/res/values-pl/strings.xml