fix invalid `{users}` variable errors in l10n `.po` files

[escattone]

+ ./scripts/l10n-fetch-lint-compile.sh
...
Linting and compiling ./gn/LC_MESSAGES/django.po...
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying b7758841df90a9b68de408259b4aa922ff2bb65c
Updated 1 path from 7b57151dc
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying 081bc35a9695d9ce5b6369f867a166d1b39b08af
Updated 1 path from f85916870
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying b11092e4ef945458bb67d1dab7db13c7ad7dc885
Updated 1 path from 10d38508a
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying 4a4880a2a851c440c71634c37cc987543b18c99f
Updated 1 path from 3749c4ff3
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying ca81ad355616917ed155d4609249b3dd7da2c3d5
Updated 1 path from 765b61d2d
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying b967b0197a63288568fe71a13ba3287d01b2eec3
Updated 1 path from 5bcfe9963
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying 46afd49da8f57785d5b328c1b77142e2a29d3490
Updated 1 path from 555034e53
Error: E201: invalid variables: {users}
Error: E201: invalid variables: {users}
lint returned an error, trying 105cca72fbc8e1cac13dd0e8ae32e257f3021164
Updated 1 path from eb31d95ab
Error: E201: invalid variables: {users}
lint returned an error, trying 867220e374b4d8f642e0a4a2297cb4cede5f2221
Updated 1 path from ade0febc4
Linting and compiling ./mr/LC_MESSAGES/djangojs.po...
Linting and compiling ./mr/LC_MESSAGES/django.po...
...