lang.tcl script to manage available languages mask and current locale

[m-kozlowski]

The firmware has a compiled string table for seven languages out of 19 possible ones. The list of these languages varies between different fw variants.
Additionally, the list of languages available for selection in the menu is filtered by a bit mask stored in eep:/SETTINGS/SGL.set

Changing the device firmware variant without a full eeprom reinitialization (factory reset is not enough) will result in a truncated list of available languages.

The purpose of this PR is to unlock the full list of languages compiled into the running firmware.

[m-kozlowski]

language bit mapping:

        0  "English"
        1  "French"
        2  "German"
        3  "Italian"
        4  "Spanish"
        6  "Portuguese"
        8  "Dutch"
        9  "Swedish"
        10 "Danish"
        11 "Norwegian"
        12 "Finnish"
        13 "Japanese (Katakana)"
        14 "Russian"
        15 "Turkish"
        16 "Chinese (Traditional)"
        17 "Chinese (Simplified)"
        18 "Polish"
        19 "Japanese (Kanji)"

There is also label for Czech, but apparently it's not used.

variable_id for language mask is 0x07

Default mask for the firmware is stored at 0x08008430 (based on 37101 SX567-0401, but it seems its common for every version >=0305)
It's loaded during boot but it gets overwritten by value from SGL.set

RAM cached value is stored at 0x2001ff3c
Changing it in runtime and triggering saving current settings to eeprom causes SGL.set to be updated with updated mask as well.
That's what I'm currently using, since I couldn't find a clean way to keep the default value from the flash without overwriting it with the value from the EEPROM. At least not without adding extra payload.

[m-kozlowski]

lang.tcl prints usage info when sourced in openocd terminal, but TL;DR:

source tcl/lang.tcl
lang::mask all

Then go to clinical menu and change language to trigger updating eeprom.