# What this PR does
Web templater had a bug with link substitutions: it replaced every link
with 'oncallsubstitutedlink{link_idx}', and then replaced them back.
But if we have more than 10 links in the message, there
would be replacements like 'oncallsubstitutedlink10', which will be
partially replaced by match from 'oncallsubstitutedlink1', yielding
incorrect links in the resulting message. This fixes this behaviour.
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
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