Let's not hope, let's check.

% rg statisticsTotal
ts/routes/graphs/reviews.ts
397:        { label: tr.statisticsTotal(), value: totalString },

ts/routes/graphs/true-retention.ts
101:            return tr.statisticsTotal();

ts/routes/graphs/added.ts
91:            label: tr.statisticsTotal(),

ts/routes/graphs/future-due.ts
131:            label: tr.statisticsTotal(),

% rg statistics_total
zsh: exit 1     rg statistics_total

The true retention graph is a bit different. How about something like the following wording instead?

# This is used in a variety of graphs to refer to the total amount of something (cards, mature cards, etc) for a given period.

If translators need to use different wording for different contexts, we'll need to split it into multiple strings.

As I do not really understand the code, I've tried to capture some screenshots. Can you tell me if those are actually the correct places?

ts/routes/graphs/reviews.ts

ts/routes/graphs/added.ts

ts/routes/graphs/future-due.ts

ts/routes/graphs/true-retention.ts

Here I'm not sure where to find it. There is:

However, here the word "Total" comes from statistics-true-retention-total and not statistics-total. I know that because we have different German translations for these two strings, and in the German translation in Anki 25.02 apprears the translation for the former.

ts/routes/graphs/true-retention.ts
101: return tr.statisticsTotal();

I don't know how dae found that. statisticsTotal doesn't exist in true-retention.ts (looking at branch main).

However, here the word "Total" comes from statistics-true-retention-total and not statistics-total.

If you are looking for the code that "creates" the total string of the true retention table, you can find it here:

Sorry, I must have had an old branch checked out when I did the check. 🤦
It looks like statisticsTotal is also used in the FSRS simulator in the deck options:

ts/routes/graphs/simulator.ts
232:                ${tr.statisticsTotal()}: ${formatY(total)}`,

Okay. I've adapted the wording.