isolating router: only match files with configured locales

[gr8bit]

Fixes too broad locale regexp

Problem

Internally, (*) was used to replace %{locale}, which was then translated to re regex part (.*), matching any yml-filename when %{locale}.yml was being used in read-section. So when using multiple files in the read section, translations often became scattered across the configured files.

Solution

As the locales in a Rails app can be configured almost freely (as the programmer pleases), I did not want to make assumptions about the used characters to replace the .*-regex. Instead, I am now using locales or base_locale from the configuration to match the locales, like this regex: (en|fr|de). It requires the user to set the available locales in the i18n-tasks.yml configuration file, at least for the isolating router.

Fixes #607

[glebm]

It requires the user to set the available locales in the i18n-tasks.yml configuration file, at least for the isolating router.

That seems like a very significant requirement change. Can we avoid requiring that somehow?

[gr8bit]

It requires the user to set the available locales in the i18n-tasks.yml configuration file, at least for the isolating router.

That seems like a very significant requirement change. Can we avoid requiring that somehow?

In order to keep the locale regex as non-greedy as possible, we could either

1. specify the actual locales to match or
2. make assumptions about the characters used in the locales and compile those into a regex

Maybe for 1. we could take the locales from somewhere else automatically? I don't know the depths of i18n-tasks so any input/help/suggestion would be appreciated. :)

[glebm]

How about we simply fall back to the old behaviour if the locales aren't specified?