doc: Add section on plurals to strings policy
Thanks to @pryds for explaining this to me on Transifex.
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@ -64,6 +64,44 @@ Avoid dividing up a message into fragments. Translators see every string separat
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There have been difficulties with use of HTML in translation strings; translators should not be able to accidentally affect the formatting of messages.
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This may sometimes be at conflict with the recommendation in the previous section.
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### Plurals
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Plurals can be complex in some languages. A quote from the gettext documentation:
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In Polish we use e.g. plik (file) this way:
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1 plik,
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2,3,4 pliki,
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5-21 pliko'w,
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22-24 pliki,
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25-31 pliko'w
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and so on
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In Qt code use tr's third argument for optional plurality. For example:
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tr("%n hour(s)","",secs/HOUR_IN_SECONDS);
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tr("%n day(s)","",secs/DAY_IN_SECONDS);
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tr("%n week(s)","",secs/WEEK_IN_SECONDS);
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This adds `<numerusform>`s to the respective `.ts` file, which can be translated separately depending on the language. In English, this is simply:
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<message numerus="yes">
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<source>%n active connection(s) to Bitcoin network</source>
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<translation>
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<numerusform>%n active connection to Bitcoin network</numerusform>
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<numerusform>%n active connections to Bitcoin network</numerusform>
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</translation>
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</message>
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Where it is possible try to avoid embedding numbers into the flow of the string at all. e.g.
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WARNING: check your network connection, %d blocks received in the last %d hours (%d expected)
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versus
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WARNING: check your network connection, less blocks (%d) were received in the last %n hours than expected (%d).
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The second example reduces the number of pluralized words that translators have to handle from three to one, at no cost to comprehensibility of the sentence.
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### String freezes
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During a string freeze (often before a major release), no translation strings are to be added, modified or removed.
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