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I want to create a web site which can be viewed with two languages, one LTR and one RTL. This means that all content should be shown in either of the two languages.
My framework is Spring, and I'm using Tiles2, but I think this question is not framework specific.
The obvious solution to supporting two languages is having everything doubled (all JSP's, fragments, etc.), and you get the part of the tree which fits the language you chose. But this causes problems when changing the web site (you might forget to update the other JSP's), and is not scalable (try doing this for 5 or 10 languages).
I know I can use properties files to host strings for the different languages, but then my web site would be a huge collection of spring:message tags and will be a lot harder to maintain (what happens if I have a paragraph of 100 lines, does this all go into a single properties line?)
Is there any kind of framework, plugin, other, which solves this problem? Has anyone come across a clever solution to this problem?
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I've never realized a complete project, just some tests. I think this problem is not so big as it seems if you follow some simple rules. Here is what I would try to do:
Specify direction with <body dir='ltr/rtl'>. This is preferred versus CSS direction attribute.
Avoid different left/right margins or paddings in all CSS. If you must break this rule, probably you'll need to use two different files (ltr.css and rtl.css) containing all these different elements.
Sometimes you'll need to move some elements from left to right or vice versa. For example, in LTR you want a menu on the left, but in RTL you want it on the right. You can achieve this using CSS, but this sometimes is complicated if you are not an expert and you must test it in all browsers. Another option is to use some IF depending on the case. This last option will fit very well if you use a grid based CSS library, like Bootstrap.
Choose carefully which CSS and JS libraries you'll use. Obviously, pick the ones which offer RTL/LTR support.
Don't worry too much about the images. If you must change one image depending on the language is probably because it has some text in it. So, you must use different images anyway. This is a problem related to i18n, not a text direction issue.
Don't let your customer to be too much fussy about it. I think that with these rules (and maybe some more) you can get a good result. But if your customer starts complaining about one pixel here and another one there, you'll need to complicate all this and probably is not necessary.
About your language properties file. Yes, use them. Always. This is a good practice even when you are only using one language: HTML structure is separated from content, is very easy to correct or translate, some words or sentences are in only one file...
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