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Starting from v9.00, Online Nandroid has support for localization using external language files. Language file should be provided at /data/local/tmp/onandroid.lang for Online Nandroid to parse the file and display the provided language strings. A sample language file for English (US) is provided below:

LANGFILE_LANGNAME="English (US)"
LANGFILE_LANGCODE="en-US"
LANGFILE_DESC="Online Nandroid Language File for English (US)"
LANGFILE_AUTHORNAME="Ameer Dawood"
LANGFILE_AUTHOREMAIL="ameer1234567890@gmail.com"
LANGFILE_VERSION="1.0"
LANGFILE_FORONLINENANDROIDVERSION="9.00"

LANG_SCRIPTNAME="Online Nandroid Backup"
LANG_SCRIPTHEAD1="* A tool to perform a nandroid backup"
LANG_SCRIPTHEAD2="  without booting into recovery."
LANG_SCRIPTHEAD3="* It is fully compatible with nandroid."
LANG_SCRIPTHEAD4="* Type 'onandroid --help' for usage"
LANG_SCRIPTHEAD5="  instructions."
LANG_SCRIPTHEAD6="* Created by Ameer Dawood"
LANG_ERROR="Error"
LANG_EXITING="Exiting"
LANG_FREEINGSPACE="Freeing Space"
LANG_NOTFOUNDSKIP="not found! Skipping backup of"
LANG_BACKINGUP="Backing up"
LANG_FSOVER2GB="The filesystem contains a file over 2GB. The backup might not restore properly!"
LANG_MAYXRESTORE="An error occured! Backup may not restore properly!"
LANG_ENTERNAME="Enter backup name"
LANG_ENTERSTORAGE="Enter storage path"
LANG_ENTERSDEXT="Enter sd-ext path"
LANG_ENTERPARTS="Enter partitions to backup"
LANG_SCRIPTSNAME="Online Nandroid"
LANG_STARTEDAT="Started at"
LANG_RUNWITH="Run with options"
LANG_BUSYBOX="Busybox"
LANG_FSLAYOUT="File System Layout"
LANG_DEVDETAILS="Device Details"
LANG_RECOVERY="Recovery"
LANG_GENRECOOVERY="Generic recovery."
LANG_NORECOVERY="No recovery detected!"
LANG_USINGBUSYBOX="Using busybox from"
LANG_CHECKROOT="Checking for root permissions"
LANG_ROOTOK="Root permissions acquired!"
LANG_NOROOT="Could not acquire root permissions!"
LANG_ANALYSEBATT="Analysing battery level"
LANG_CANNOTBATT="Unable to check battery level! Taking a chance here"
LANG_BATTOK="Sufficient battery available!"
LANG_NOBATT="Sufficient battery not available!"
LANG_BATTLEVEL="Battery Level"
LANG_CHECKINGBB="Checking version of BusyBox installed"
LANG_BBLESS="BusyBox version less than 1.20 found."
LANG_BBOK="BusyBox version 1.20 or above installed!"
LANG_BBCANNOTCHECK="Unable to check BusyBox version. Taking chances here"
LANG_SEARCHSD="Searching for SD card"
LANG_ALTERNATEMEDIA="Alternate storage media provided!"
LANG_SDNOTFOUND="SD card not found!"
LANG_MOUNTS="Mounts"
LANG_SDFOUND="SD card found!"
LANG_ISMTDDEV="This is an MTD based device!"
LANG_ISEMMCDEV="This is an EMMC based device!"
LANG_ISMTKDEV="This is an MTK based device!"
LANG_HASPATCH="This device has a patch file installed!"
LANG_INCREMSELECTD="Incremental backup mode selected by default!"
LANG_INCREMSELECTR="Incremental backup mode selected at run time!"
LANG_SPLITSELECTD="Split backup mode selected by default!"
LANG_SPLITSELECTR="Split backup mode selected at run time!"
LANG_TWRPSELECTR="TWRP backup mode selected at run time!"
LANG_TWRPCOMPN="TWRP compression enabled at run time!"
LANG_TWRPCOMPG="TWRP compression (gzip) enabled at run time!"
LANG_ADVSELECTR="Advanced backup mode selected at run time!"
LANG_ADVSELECTD="Advanced backup mode selected by default!"
LANG_CHECKTOOLS="Checking for required tools"
LANG_NOMKYAFFS2IMAGE="mkyaffs2image not found in path!"
LANG_NODEDUPE="dedupe not found in path!"
LANG_NOBUSYBOX="busybox not found in path!"
LANG_ALLTOOLSOK="All required tools available!"
LANG_CANNOTCHANGETO="Could not change to"
LANG_CANNOTCREATE="Cannot create"
LANG_REPLSELECTEDR="Replace backup mode selected at run time!"
LANG_ALREADYEXISTS="already exists!"
LANG_WANTTOREPLACE="Do you want to replace?"
LANG_REPLSELECTP="Replace backup mode selected upon prompt!"
LANG_CANNOTWRITETO="Cannot write to"
LANG_GARBSELECT="Garbage Collection mode selected!"
LANG_GARBCOMPL="Garbage Collection Completed in"
LANG_MINUTES="minutes"
LANG_SECONDS="seconds"
LANG_CHECKDISKSPACE="Checking disk space"
LANG_SDFREESPACE="SD Card Free Space"
LANG_REQUIREDSPACE="Required Space"
LANG_NOSPACE="Not enough disk space!"
LANG_PARTITIONS="Partitions"
LANG_SPACEOK="Necessary disk space available!"
LANG_DETECTINGEXCL="Detecting mountpoints to exclude"
LANG_BACKINGUPTO="Backing up to"
LANG_BACKINGUPOLD="Backing up the old backup for replace operation"
LANG_PATCHNOTICE="Consider installing patch file for your device, for a complete nandroid!"
LANG_REPLACINGOLD="Replacing old backup with new backup"
LANG_GENMD5SUMFOR="Generating md5sum for"
LANG_GENMD5SUM="Generating md5sum"
LANG_VERIFYMD5SUM="Verifying md5sum"
LANG_BACKUPCOMPL="Online Nandroid Backup Completed in"
LANG_FILESBKPEDUP="Files Backed-up"

• A language file is essentially a shell script consisting of variables for each string in Online Nandroid that can be localized and their respective strings in double quotes.
• The language file should not contain any shell comments. If it contains any such shell comments, Online Nandroid will not parse the language file.
• The first 7 lines of the language file are file headers, used as follows:
  • LANGFILE_LANGNAME which is the name of the language, such as English (US).
  • LANGFILE_LANGCODE which is the IETF Language Tag, such as en-US.
  • LANGFILE_DESC which is a description for the language file, such as Online Nandroid Language File for English (US).
  • LANGFILE_AUTHORNAME which is the name of the author who did the localization, such as Ameer Dawood.
  • LANGFILE_AUTHOREMAIL which is the email address of the author, such as ameer1234567890@gmail.com.
  • LANGFILE_VERSION which is the version of the language file, such as 1.0.
  • LANGFILE_FORONLINENANDROIDVERSION which is the version of Online Nandroid for which the language file was created, such as 9.00.

• Note: If you have created or wants to create a language file for your preferred language, you are most welcome to contact me and I shall be happy to include it in Online Nandroid's repository and any other places where I provide language files.
• Note: Since language files are essentially shell scripts and Online Nandroid uses shell built-in eval to parse language files, this opens a vast opportunity for other developers who bundle the script in their tools and apps to change some of the behaviors of Online Nandroid.