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2020-01-25luci-base: add support for plural translations and contexts in Lua apiJo-Philipp Wich
- Introduce a new luci.template.parser.ntranslate() function which takes a count, a singular and a plural translation string as well as an optional context argument and returns the appropriate, language specific plural translation. - Introduce an optional translation context argument in the existing luci.template.parser.translate() function - Support translation contexts in LuCI template directives. Translation messages are split on the first unescaped pipe character and the reamining string after the pipe is treated as context. Examples: - `string.format(p.ntranslate(n, "1 apple", "%d apples"), n)` will return an appropriate plural translation for the given amount. - `translate("Load", "The system load")` will return an appropiate translation for `Load`, using `The system load` as disambiguation context (a `msgctxt` directive in *.po files). - Likewise `<%:Load|The system load%>` will translate the word `Load` while using the remainder of the string as context. - To use pipes in translations strings literally, they must be escaped: `<%:Use the "\|" character%>` will translate the literal string `Use the "|" character`. Signed-off-by: Jo-Philipp Wich <jo@mein.io>