Improve plural marks

[quiple]

This PR combines duplicate parts of plural strings.

Before:

#: src/components/moderation/LabelsOnMe.tsx:57
msgid "{0, plural, one {# label has been placed on this account} other {# labels have been placed on this account}}"
msgstr ""

#: src/components/moderation/LabelsOnMe.tsx:63
msgid "{0, plural, one {# label has been placed on this content} other {# labels have been placed on this content}}"
msgstr ""

After:

#: src/components/moderation/LabelsOnMe.tsx:57
msgid "{0, plural, one {# label has} other {# labels have}} been placed on this account"
msgstr ""

#: src/components/moderation/LabelsOnMe.tsx:63
msgid "{0, plural, one {# label has} other {# labels have}} been placed on this content"
msgstr ""

[gaearon]

Hmm. I'm not sure this makes sense because it leaves less freedom to other languages to rearrange words (if needed for grammar).

[quiple]

@gaearon It looks like you can freely reposition the plural string ({0, plural, one {# label has} other {# labels have}} in the example above) or put multiple of them in <Trans>.