SpecialCharacterInspector: Don't auto-capitalise the headings

Although text-transform: capitalize; makes the i18n look a bit better in English,
this creates incorrect labels for some languages, such as Polish.

Bug: T78327
Change-Id: I4f4991462dd89febb7ade23e81bc066f350ecac0
Merge "SpecialCharacterInspector: Don't auto-capitalise the headings"