/etc/X11/app-defaults/mtt is in xawtv 3.102-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | ! general
mtt.title:				teletext test utility
mtt.deleteResponse:			DO_NOTHING
! fonts
*renderTable:
*renderTable.fontType: FONT_IS_FONTSET
*renderTable.fontName: \
 -misc-fixed-bold-r-normal--13-*-*-*-*-*-iso10646-1, \
 -misc-fixed-bold-r-normal--13-*-*-*-*-*-iso8859-* \
 -*-*-*-*--13-*-*-*-*-*-*-*,*
! arrange widgets
mtt.form.*.leftAttachment:		ATTACH_FORM
mtt.form.*.rightAttachment:		ATTACH_FORM
mtt.form.tool.topAttachment:		ATTACH_WIDGET
mtt.form.tool.topWidget:		bar
mtt.form.tt.topAttachment:		ATTACH_WIDGET
mtt.form.tt.topWidget:			tool
mtt.form.tt.bottomAttachment:		ATTACH_FORM
mtt.form.tt.background:			black
mtt.form.tt.foreground:			white
! menubar
mtt*bar.file.labelString:		File
mtt*bar.file.mnemonic:			F
mtt*bar.edit.labelString:		Edit
mtt*bar.edit.mnemonic:			E
mtt*bar.go.labelString:			Go to
mtt*bar.go.mnemonic:			G
mtt*bar.subpage.labelString:		Subpage
mtt*bar.subpage.mnemonic:		S
mtt*bar.station.labelString:		Stations
mtt*bar.station.mnemonic:		t
mtt*bar.font.labelString:		Fonts
mtt*bar.font.mnemonic:			o
! toolbar
mtt*tool.orientation:			HORIZONTAL
mtt*tool.?.shadowThickness:		1
mtt*tool.?.labelType:			PIXMAP
mtt*tool.XmSeparator.orientation:	VERTICAL
mtt*tool.XmSeparator.width:		12
mtt*tool.XmSeparator.margin:		3
mtt*tool.100.labelPixmap:		home
mtt*tool.prev.labelPixmap:		prev
mtt*tool.next.labelPixmap:		next
mtt*tool.exit.labelPixmap:		exit
! menu file
mtt*bar*new.labelString:		New window
mtt*bar*new.mnemonic:			N
mtt*bar*new.acceleratorText:		N
mtt*bar*new.accelerator:		<Key>N
mtt*bar*save.labelString:		Save as ...
mtt*bar*save.mnemonic:			S
mtt*bar*save.acceleratorText:		S
mtt*bar*save.accelerator:		<Key>S
mtt*bar*quit.labelString:		Close
mtt*bar*quit.mnemonic:			C
mtt*bar*quit.acceleratorText:		Q
mtt*bar*quit.accelerator:		<Key>Q
! menu edit
mtt*bar*copy.labelString:		Copy
mtt*bar*copy.mnemonic:			C
mtt*bar*copy.acceleratorText:		Ctrl+C
mtt*bar*copy.accelerator:		Ctrl<Key>C
! menu go
mtt*bar*100.labelString:		Index
mtt*bar*100.mnemonic:			I
mtt*bar*100.acceleratorText:		I
mtt*bar*100.accelerator:		<Key>I
mtt*bar*prev.labelString:		Previous page
mtt*bar*prev.mnemonic:			P
mtt*bar*prev.acceleratorText:		PgUp
mtt*bar*prev.accelerator:		<Key>Page_Up
mtt*bar*next.labelString:		Next page
mtt*bar*next.mnemonic:			N
mtt*bar*next.acceleratorText:		PgDown
mtt*bar*next.accelerator:		<Key>Page_Down
! menu subpage
mtt*bar*s00.labelString:		cycle subpages
! save as dialog
mtt.save_popup.title:			Save File
mtt.save_popup*format.labelString:	Character set:
 |