R1:17ebf3a11fb5

Remove PHP version suffixes on "Missing Required Extensions"; Mention dnf

Summary:
Explicitly mentioning PHP5 packages is outdated and confusing.
Also, mentioning dnf together with yum (apparently yum is still in use!). Good for yum users.

Closes T15352

Test Plan: Applied this change and strings on the "Missing Required Extensions" page rendered as expected.

Reviewers: O1 Blessed Committers, valerio.bozzolan, jgleeson

Reviewed By: O1 Blessed Committers, valerio.bozzolan, jgleeson

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