Like I already explained in a comment, you could make this mod independent of game updates and other mods, by not overwriting the whole character_window_l_english file.
You can instead give the file a custom name (keep in mind that files are loaded alphabetically, so your addons still work) and only include the relevant strings you need to overwrite. This way your mod is more compatible to game and other mods (unless they overwrite exactly these strings)


There is a minor downside (because the game is buggy I guess):
Although this works, sth really strange happens, maybe this is the reason you did not do it like this: (I use the german localization): The german vanilla string for "HEALTH_FINE_DESC_ME" is "Euch geht es gut". When I append anything (eg. "tooltip") after this, it won't show ingame, it will stay like this. Only if I change it somehow, eg. change the last letters: "Euch geht es gum tooltip" or set it only to "tooltip" it will display everything correctly ingame. No clue why this happens...
My solution: simply remove the original text completely and only display the framework. These "You feel fine" strings are not that important anyway. But maybe you find another solution.


So my modfile now only includes this (no other strings):

TOOLTIP_FRAMEWORK_HEALTH:0 "$game_concept_health$: [CHARACTER.GetHealth|1V]"
TOOLTIP_FRAMEWORK_FERTILITY:0 "$game_concept_fertility$: [CHARACTER.GetFertility|%0V]"
TOOLTIP_FRAMEWORK_STRESS:0 "$game_concept_stress$: [CHARACTER.GetStress|0V]"

TOOLTIP_FRAMEWORK_ADDITIONS: "$TOOLTIP_FRAMEWORK_HEALTH$\n$TOOLTIP_FRAMEWORK_FERTILITY$\n$TOOLTIP_FRAMEWORK_STRESS$"

HEALTH_DYING_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_DYING_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_NEAR_DEATH_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_NEAR_DEATH_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_POOR_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_POOR_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_FINE_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_FINE_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_GOOD_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_GOOD_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_EXCELLENT_DESC: "$TOOLTIP_FRAMEWORK_ADDITIONS$"
HEALTH_EXCELLENT_DESC_ME: "$TOOLTIP_FRAMEWORK_ADDITIONS$"

What do you think?