This is amazing, thank you!
I do have more
sorry. So perhaps when, if, you have the time and the desire to translate some more, here is what's missing now:
***** Found 78 missing translations for language ja
<!-- res/values/strings__global.xml -->
<string name="folder_manage">Manage folders…</string>
<string name="webview_context_menu_email">Send email</string>
<string name="webview_context_menu_add_contacts">Open/Save in Contacts</string>
<string name="webview_context_menu_email_copy_done">The email has been copied</string>
<plurals name="confirm_move_archive_message_known">
%d message will be moved to Archive.
%d messages will be moved to Archive.
</plurals>
<!-- res/values/strings_account_backup_restore.xml -->
<string name="account_backup_restore_onedrive_warning">OneDrive doesn't like overwriting existing files.\n\nIf the Upload button is disabled, please run OneDrive separately from AquaMail and delete the old backup file. Then return here to retry.</string>
<!-- res/values/strings_account_options.xml -->
<string name="account_options_prefs_ews">Exchange options</string>
<string name="account_options_prefs_ews_sync_calendar">Sync calendar</string>
<string name="account_options_prefs_ews_sync_calendar_summary">Sync server calendar with the device's calendar</string>
<string name="account_options_prefs_ews_sync_calendar_turn_off_confirmation">This will remove any already synced calendars and their events from the device's Calendar.</string>
<string name="account_options_prefs_ews_sync_calendar_time_period">What to sync from the server</string>
<string name="account_options_prefs_ews_sync_calendar_time_keep">How long to keep on the device</string>
<plurals name="account_options_prefs_ews_sync_calendar_time_plural_template">
%1$d month
%1$d months
</plurals>
<string name="account_options_prefs_ews_sync_calendar_force_local">Force local time zone</string>
<string name="account_options_prefs_ews_sync_calendar_force_local_summary">Use the device's time zone for synced events (compatibility)</string>
<string name="account_options_prefs_preload_unlim">No limit</string>
<string name="account_options_folder_sync_type_archive">Sync as archive</string>
<string name="account_options_folder_sync_type_archive_set">Archive, do not sync</string>
<string name="account_options_folder_search_hint">Search folders</string>
<string name="account_options_folder_create">Create folder</string>
<string name="account_options_prefs_category_calendars">Calendars</string>
<!-- res/values/strings_attachments.xml -->
<string name="attachment_calendar_sync">Waiting for Calendar sync…</string>
<!-- res/values/strings_cwac.xml -->
<string name="cwac_richedittext_link">Set link</string>
<string name="cwac_richedittext_link_select_first">To set a link, please enter and select some text first</string>
<!-- res/values/strings_errors.xml -->
<string name="mail_task_create_folder">creating folder</string>
<string name="mail_task_calendar">syncing calendar</string>
<!-- res/values/strings_ical.xml -->
<string name="ical_calendar">Calendar</string>
<string name="ical_state_organizer">organizer</string>
<string name="ical_action_view_in_calendar">View in Calendar</string>
<string name="ical_action_remove_from_calendar">Remove from Calendar</string>
<string name="ical_action_add_reply_note">Add note to your response</string>
<string name="ical_dialog_account_has_sync">The event will be synced to Calendar</string>
<!-- res/values/strings_message_display.xml -->
<string name="message_display_read_receipt_never">Never</string>
<!-- res/values/strings_message_list.xml -->
<string name="message_list_op_move_archive">Move to Archive</string>
<!-- res/values/strings_new_message.xml -->
<string name="new_message_malformed_email_single">Please leave blank or enter exactly one address</string>
<string name="new_message_menu_delivery_receipt">Request delivery receipt</string>
<string name="new_message_delivery_receipt_prompt">Delivery receipt requested</string>
<string name="new_message_pick_all">All</string>
<string name="new_message_contacts_searching_server">Searching server contacts…</string>
<!-- res/values/strings_prefs.xml -->
<string name="prefs_ui_two_pane_off_when_mw">Single panel in MW mode</string>
<string name="prefs_ui_two_pane_off_when_mw_summary">Use single panel mode when launched inside Samsung's MultiWindow</string>
<string name="prefs_ui_confirm_move_to_archive">Confirm moving to Archive</string>
<string name="prefs_ui_confirm_move_to_archive_summary">Ask for a confirmation before moving to the Archive folder</string>
<string name="prefs_contacts_compose_chips">Contact chips</string>
<string name="prefs_contacts_compose_chips_summary">Show contacts as "chips", not text</string>
<string name="prefs_contacts_compose_chips_replace_names">Replace contact names</string>
<string name="prefs_contacts_compose_chips_replace_names_summary">Replace original contact names with those from your Contacts</string>
<string name="prefs_calendar_alarm_time">Alarm when saving invites</string>
<string name="prefs_calendar_alarm_none">None</string>
<string name="prefs_calendar_alarm_at_event">At time of event</string>
<string name="prefs_calendar_alarm_5m">5 minutes before</string>
<string name="prefs_calendar_alarm_15m">15 minutes before</string>
<string name="prefs_calendar_alarm_30m">30 minutes before</string>
<string name="prefs_calendar_alarm_1h">1 hour before</string>
<string name="prefs_calendar_view_type">View in Calendar (Exchange accounts) goes to</string>
<string name="prefs_calendar_view_type_event">The event itself</string>
<string name="prefs_calendar_view_type_day">Day view for the event's date</string>
<string name="prefs_ui_webview_zoom_to_fit_auto_sizing">Enlarge small text</string>
<string name="prefs_ui_webview_zoom_to_fit_auto_sizing_summary">Enlarge text that would otherwise get too small when shrunk</string>
<string name="prefs_swipe_message_list_op_archive">Move to archive</string>
<string name="prefs_swipe_message_list_op_archive_or_delete">Archive or delete (depeding on the account)</string>
<string name="prefs_notify_led_time_on">Turn LED on for…</string>
<string name="prefs_notify_led_time_off">Keep LED off for…</string>
<plurals name="prefs_notify_led_time_template">
%1$d second
%1$d seconds
</plurals>
<string name="prefs_notify_priority">High priority notifications</string>
<string name="prefs_notify_priority_summary">New in Android 5.0</string>
<string name="prefs_notify_actions_confirm">Confirm notification actions…</string>
<string name="prefs_notify_actions_confirm_activity">In a separate window</string>
<string name="prefs_notify_actions_confirm_notification">In notifications themselves</string>
<string name="prefs_notify_silent_change_interval">Adjust mail check schedule</string>
<string name="prefs_notify_silent_change_interval_none">( do not adjust )</string>
<string name="prefs_notify_silent_no_push">Turn off IMAP push</string>
<string name="prefs_notify_silent_no_push_summary">Do not use IMAP push during this time</string>
<string name="prefs_notify_weekend_all_no_push">Turn off IMAP push</string>
<string name="prefs_notify_weekend_all_no_push_summary">Do not use IMAP push on these days</string>
<!-- res/values/strings_sync.xml -->
<string name="sync_mail_provider_label">Email</string>
<!-- res/values/strings_widget.xml -->
<string name="prefs_widget_larger_font">Larger font</string>
<string name="prefs_widget_larger_font_summary">Use a larger font size</string>