Add sections about common problems and their solutions into INTL documentation [CORE1221]

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Submitted by: @pcisar

Relate to CORE1172
Relate to CORE202

There were some collation-related issues that could be easily fixed with new INTL support in 2.1 This needs to be properly documented (a section in README.intl.txt will be enough). See linked tickets for details.

[firebird-automations]

Modified by: @pcisar

Link: This issue depends on CORE1172 [ CORE1172 ]

[firebird-automations]

Modified by: @pcisar

Link: This issue depends on CORE1172 [ CORE1172 ] =>

[firebird-automations]

Modified by: @pcisar

Link: This issue relate to CORE1172 [ CORE1172 ]

[firebird-automations]

Modified by: @pcisar

Link: This issue relate to CORE202 [ CORE202 ]

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Modified by: @pcisar

Fix Version: 2.1 Beta 1 [ 10141 ]

Fix Version: 2.1.0 [ 10041 ] =>

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Modified by: @dyemanov

Fix Version: 2.1 Beta 2 [ 10190 ]

Fix Version: 2.1 Beta 1 [ 10141 ] =>

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Commented by: @asfernandes

I put a lot of info in this file and it's now in the relnotes.
Isn't it sufficient?

[firebird-automations]

Modified by: @dyemanov

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

[firebird-automations]

Modified by: @pcisar

status: Resolved [ 5 ] => Closed [ 6 ]

[firebird-automations]

Modified by: @pcisar

Workflow: jira [ 11910 ] => Firebird [ 14207 ]