Some lint error fixes

Trovebox-Android-Common
- GuiUtils: fixed validateBasicTextData methods to add required string
parameter when requesting a resource
- res/layout/action_mode_sync.xml: removed duplicate xmlns:android
declaration
- res/layout/action_mode_sync2.xml: removed duplicate xmlns:android
declaration
- res/layout/fragment_photo_details.xml: removed image_details id
duplicate
- res/layout/fragment_sync_select_photos.xml: remved xmlns:app
declaration
- res/values/strings.xml: fixed notification_upload_multiple_title
constant
- res/values/styles.xml: fixed textSize attribute to be in sp units for
the button_text and TextTitle styles declaration
- res/values-ru/strings.xml: added few and many string plurals to the
sync_upload_selected_confirmation  and number_of_items_selected

Trovebox-Android-App
- ImageFragment: added FILL_PARENT constant usage for the API level 7
devicesto the onCreateView method
- Peferences: updated PREFERENCES_MODE constant to be MODE_PRIVATE
- res/layout/activity_account_signup.xml: removed
- res/layout/activity_upload.xml: remved app namespace delcaration
- res/layout/fragment_profile.xml: remved app namespace delcaration
- res/layout/fragment_sync_upload_settings.xml: remved app namespace
delcaration
- res/layout/fragment_tags.xml: added hint for the edit_search field
- res/layout/list_item_newest_photos.xml: removed
- res/values/strings.xml, res/values-ru/strings.xml: added
enter_tags_manually constant
- AndroidManifest.xml: added exported="false" for the UploadsProvider
declaration