ok after some research you can't do this.
in vix audioselection.py (the subtitle settings file) you have
elif sub[0] == 1: # teletext |
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getConfigMenuItem("config.subtitles.ttx_subtitle_colors"), |
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getConfigMenuItem("config.subtitles.ttx_subtitle_original_position"), |
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getConfigMenuItem("config.subtitles.subtitle_fontsize"), |
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getConfigMenuItem("config.subtitles.subtitle_position"), |
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getConfigMenuItem("config.subtitles.subtitle_rewrap"), |
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getConfigMenuItem("config.subtitles.subtitle_borderwidth"), |
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getConfigMenuItem("config.subtitles.showbackground"), |
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getConfigMenuItem("config.subtitles.subtitle_alignment"), |
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getConfigMenuItem("config.subtitles.subtitle_bad_timing_delay"), |
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getConfigMenuItem("config.subtitles.subtitle_noPTSrecordingdelay"), |
|
]
this is defined in esubtitle.cpp
openatv doesn't define subtitles.showbackground in its esubtitle.cpp
The cpp files are C++ files that have to be compiled when your enigma2 build is built. You can't just edit them afterwards.
They don't exist anywhere on your box as such.